diff --git a/frontend_tests/node_tests/common.js b/frontend_tests/node_tests/common.js
index 3bd1435315..7074030b65 100644
--- a/frontend_tests/node_tests/common.js
+++ b/frontend_tests/node_tests/common.js
@@ -101,25 +101,25 @@ run_test("adjust_mac_shortcuts", () => {
         return false;
     };
     key_no = 1;
-    keys_to_test_non_mac.forEach((value, key) => {
+    for (const [key, value] of keys_to_test_non_mac) {
         keys_elem_list.push(get_key_stub_html(key, value, "hotkey_non_mac_" + key_no));
         key_no += 1;
-    });
+    }
 
     common.adjust_mac_shortcuts(".markdown_content");
-    keys_elem_list.forEach((key_elem) => {
+    for (const key_elem of keys_elem_list) {
         assert(key_elem.text(), key_elem.expected_key());
-    });
+    }
 
     keys_elem_list = [];
     key_no = 1;
     common.has_mac_keyboard = function () {
         return true;
     };
-    keys_to_test_mac.forEach((value, key) => {
+    for (const [key, value] of keys_to_test_mac) {
         keys_elem_list.push(get_key_stub_html(key, value, "hotkey_" + key_no));
         key_no += 1;
-    });
+    }
 
     $(".markdown_content").each = (f) => {
         for (const key_elem of keys_elem_list) {
@@ -127,9 +127,9 @@ run_test("adjust_mac_shortcuts", () => {
         }
     };
     common.adjust_mac_shortcuts(".markdown_content");
-    keys_elem_list.forEach((key_elem) => {
+    for (const key_elem of keys_elem_list) {
         assert.equal(key_elem.text(), key_elem.expected_key());
-    });
+    }
 
     const markdown_hotkey_1 = get_key_stub_html(
         "Ctrl + Backspace",
diff --git a/frontend_tests/node_tests/composebox_typeahead.js b/frontend_tests/node_tests/composebox_typeahead.js
index 7b23251cb4..ad9c087da6 100644
--- a/frontend_tests/node_tests/composebox_typeahead.js
+++ b/frontend_tests/node_tests/composebox_typeahead.js
@@ -1338,13 +1338,13 @@ run_test("begins_typeahead", () => {
     assert_typeahead_equals("```test", "ing", false);
     assert_typeahead_equals("~~~test", "ing", false);
     const terminal_symbols = ",.;?!()[]> \"'\n\t";
-    terminal_symbols.split().forEach((symbol) => {
+    for (const symbol of terminal_symbols.split()) {
         assert_stream_list("#test", symbol);
         assert_typeahead_equals("@test", symbol, all_mentions);
         assert_typeahead_equals(":test", symbol, emoji_list);
         assert_typeahead_equals("```test", symbol, lang_list);
         assert_typeahead_equals("~~~test", symbol, lang_list);
-    });
+    }
 });
 
 run_test("tokenizing", () => {
diff --git a/frontend_tests/node_tests/filter.js b/frontend_tests/node_tests/filter.js
index aabbae962b..5a230b2e42 100644
--- a/frontend_tests/node_tests/filter.js
+++ b/frontend_tests/node_tests/filter.js
@@ -1481,9 +1481,9 @@ run_test("navbar_helpers", () => {
         },
     ];
 
-    test_cases.forEach((test_case) => {
+    for (const test_case of test_cases) {
         test_helpers(test_case);
-    });
+    }
 
     // TODO: these may be removed, based on design decisions
     const sender_me = [{operator: "sender", operand: "me"}];
@@ -1504,9 +1504,9 @@ run_test("navbar_helpers", () => {
         },
     ];
 
-    redirect_edge_cases.forEach((test_case) => {
+    for (const test_case of redirect_edge_cases) {
         test_redirect_url_with_search(test_case);
-    });
+    }
 
     // TODO: test every single one of the "ALL" redirects from the navbar behaviour table
 
diff --git a/frontend_tests/node_tests/markdown.js b/frontend_tests/node_tests/markdown.js
index b5d5b5fa36..d666077796 100644
--- a/frontend_tests/node_tests/markdown.js
+++ b/frontend_tests/node_tests/markdown.js
@@ -235,22 +235,22 @@ run_test("markdown_detection", () => {
         "YouTube URL https://www.youtube.com/watch?v=HHZ8iqswiCw&feature=youtu.be&a",
     ];
 
-    no_markup.forEach((content) => {
+    for (const content of no_markup) {
         assert.equal(markdown.contains_backend_only_syntax(content), false);
-    });
+    }
 
-    markup.forEach((content) => {
+    for (const content of markup) {
         assert.equal(markdown.contains_backend_only_syntax(content), true);
-    });
+    }
 });
 
 run_test("marked_shared", () => {
     const tests = markdown_test_cases.regular_tests;
 
-    tests.forEach((test) => {
+    for (const test of tests) {
         // Ignore tests if specified
         if (test.ignore === true) {
-            return;
+            continue;
         }
 
         const message = {raw_content: test.input};
@@ -266,7 +266,7 @@ run_test("marked_shared", () => {
         } else {
             markdown_assert.equal(test.expected_output, output, error_message);
         }
-    });
+    }
 });
 
 run_test("message_flags", () => {
@@ -531,7 +531,7 @@ run_test("marked", () => {
         },
     ];
 
-    test_cases.forEach((test_case) => {
+    for (const test_case of test_cases) {
         // Disable emoji conversion by default.
         page_params.translate_emoticons = test_case.translate_emoticons || false;
 
@@ -542,7 +542,7 @@ run_test("marked", () => {
         markdown.apply_markdown(message);
         const output = message.content;
         assert.equal(output, expected);
-    });
+    }
 });
 
 run_test("topic_links", () => {
@@ -671,9 +671,9 @@ run_test("backend_only_realm_filters", () => {
         "Here is the PR-#123.",
         "Function abc() was introduced in (PR)#123.",
     ];
-    backend_only_realm_filters.forEach((content) => {
+    for (const content of backend_only_realm_filters) {
         assert.equal(markdown.contains_backend_only_syntax(content), true);
-    });
+    }
 });
 
 run_test("python_to_js_filter", () => {
diff --git a/frontend_tests/node_tests/message_store.js b/frontend_tests/node_tests/message_store.js
index 54b7714cae..ec1a8c4363 100644
--- a/frontend_tests/node_tests/message_store.js
+++ b/frontend_tests/node_tests/message_store.js
@@ -170,14 +170,14 @@ run_test("message_booleans_parity", () => {
         const update_message = {topic: "update_booleans"};
         message_store.set_message_booleans(set_message);
         message_store.update_booleans(update_message, flags);
-        Object.keys(expected_message).forEach((key) => {
+        for (const key of Object.keys(expected_message)) {
             assert.equal(
                 set_message[key],
                 expected_message[key],
                 `'${key}' != ${expected_message[key]}`,
             );
             assert.equal(update_message[key], expected_message[key]);
-        });
+        }
         assert.equal(set_message.topic, "set_message_booleans");
         assert.equal(update_message.topic, "update_booleans");
     };
diff --git a/frontend_tests/node_tests/rendered_markdown.js b/frontend_tests/node_tests/rendered_markdown.js
index e5acec1efa..183acb9ae6 100644
--- a/frontend_tests/node_tests/rendered_markdown.js
+++ b/frontend_tests/node_tests/rendered_markdown.js
@@ -59,9 +59,9 @@ stream_data.add_sub(stream);
 
 const $array = (array) => {
     const each = (func) => {
-        array.forEach((e) => {
+        for (const e of array) {
             func.call(e);
-        });
+        }
     };
     return {each};
 };
diff --git a/frontend_tests/node_tests/settings_org.js b/frontend_tests/node_tests/settings_org.js
index 0c545800de..8f7f36e13e 100644
--- a/frontend_tests/node_tests/settings_org.js
+++ b/frontend_tests/node_tests/settings_org.js
@@ -1018,10 +1018,10 @@ run_test("misc", () => {
         ".dropdown_list_reset_button:enabled",
         $.create("<disable button>"),
     );
-    widget_settings.forEach((name) => {
+    for (const name of widget_settings) {
         const elem = $.create(`#${name}_widget #${name}_name`);
         elem.closest = () => dropdown_list_parent;
-    });
+    }
 
     // We do not define any settings we need in page_params yet, but we don't need to for this test.
     blueslip.expect(
diff --git a/frontend_tests/node_tests/spoilers.js b/frontend_tests/node_tests/spoilers.js
index 5876677239..4632f329fc 100644
--- a/frontend_tests/node_tests/spoilers.js
+++ b/frontend_tests/node_tests/spoilers.js
@@ -12,9 +12,9 @@ zrequire("spoilers");
 // This function is taken from rendered_markdown.js and slightly modified.
 const $array = (array) => {
     const each = (func) => {
-        array.forEach((elem, index) => {
+        for (const [index, elem] of array.entries()) {
             func.call(this, index, elem);
-        });
+        }
     };
     return {each};
 };
diff --git a/frontend_tests/node_tests/typeahead_helper.js b/frontend_tests/node_tests/typeahead_helper.js
index 42efea3b56..e9a1f4188e 100644
--- a/frontend_tests/node_tests/typeahead_helper.js
+++ b/frontend_tests/node_tests/typeahead_helper.js
@@ -115,7 +115,9 @@ run_test("sort_streams", () => {
     ];
     process_test_streams();
 
-    test_streams.forEach(stream_data.update_calculated_fields);
+    for (const sub of test_streams) {
+        stream_data.update_calculated_fields(sub);
+    }
     test_streams = th.sort_streams(test_streams, "wr");
     assert.deepEqual(test_streams[0].name, "Docs"); // Description match
     assert.deepEqual(test_streams[1].name, "Denmark"); // Popular stream
diff --git a/frontend_tests/zjsunit/index.js b/frontend_tests/zjsunit/index.js
index ab1022e3cd..12dcdb1f05 100644
--- a/frontend_tests/zjsunit/index.js
+++ b/frontend_tests/zjsunit/index.js
@@ -75,7 +75,7 @@ function run_one_module(file) {
 test.set_verbose(files.length === 1);
 
 try {
-    files.forEach((file) => {
+    for (const file of files) {
         namespace.set_global("window", window);
         namespace.set_global("to_$", () => window);
         namespace.set_global("location", {
@@ -98,7 +98,7 @@ try {
 
         namespace.restore();
         Handlebars.HandlebarsEnvironment.call(Handlebars);
-    });
+    }
 } catch (error) {
     if (error.stack) {
         console.info(short_tb(error.stack));
diff --git a/frontend_tests/zjsunit/markdown_assert.js b/frontend_tests/zjsunit/markdown_assert.js
index 49566cbd7f..445daa225e 100644
--- a/frontend_tests/zjsunit/markdown_assert.js
+++ b/frontend_tests/zjsunit/markdown_assert.js
@@ -76,9 +76,9 @@ class MarkdownComparer {
         }
 
         // If put in above forEach loop, causes issues (possible nodes.attribute invalidation?)
-        attributeList.forEach((attr) => {
+        for (const attr of attributeList) {
             node.removeAttribute(attr.name);
-        });
+        }
 
         attributeList.sort((a, b) => {
             const name_a = a.name;
@@ -92,9 +92,9 @@ class MarkdownComparer {
         });
 
         // Put them back in, in order
-        attributeList.forEach((attribute) => {
+        for (const attribute of attributeList) {
             node.setAttribute(attribute.name, attribute.value);
-        });
+        }
 
         if (node.hasChildNodes()) {
             for (const childNode of node.children) {
diff --git a/frontend_tests/zjsunit/mdiff.js b/frontend_tests/zjsunit/mdiff.js
index 464fe0ee6b..2c6996558e 100644
--- a/frontend_tests/zjsunit/mdiff.js
+++ b/frontend_tests/zjsunit/mdiff.js
@@ -25,7 +25,7 @@ function apply_color(input_string, changes) {
         ["insert", (string) => "\u001B[32m" + string + "\u001B[0m"],
         ["replace", (string) => "\u001B[33m" + string + "\u001B[0m"],
     ]);
-    changes.forEach((change) => {
+    for (const change of changes) {
         if (formatter.has(change.tag)) {
             processed_string += input_string.slice(previous_index, change.beginning_index);
             processed_string += formatter.get(change.tag)(
@@ -33,7 +33,7 @@ function apply_color(input_string, changes) {
             );
             previous_index = change.ending_index;
         }
-    });
+    }
 
     processed_string += input_string.slice(previous_index);
     return processed_string;
@@ -102,7 +102,7 @@ function diff_strings(string_0, string_1) {
 
     ndiff_output = difflib.ndiff(string_0.split("\n"), string_1.split("\n"));
 
-    ndiff_output.forEach((line) => {
+    for (const line of ndiff_output) {
         if (line.startsWith("+")) {
             output_lines.push(line);
         } else if (line.startsWith("-")) {
@@ -116,7 +116,7 @@ function diff_strings(string_0, string_1) {
         } else {
             output_lines.push(line);
         }
-    });
+    }
 
     const emphasize_codes = (string) =>
         "\u001B[34m" + string.slice(0, 1) + "\u001B[0m" + string.slice(1);
diff --git a/frontend_tests/zjsunit/namespace.js b/frontend_tests/zjsunit/namespace.js
index 10cafc89fe..77a69512e8 100644
--- a/frontend_tests/zjsunit/namespace.js
+++ b/frontend_tests/zjsunit/namespace.js
@@ -61,9 +61,9 @@ exports.clear_zulip_refs = function () {
 };
 
 exports.restore = function () {
-    requires.forEach((fn) => {
+    for (const fn of requires) {
         delete require.cache[require.resolve(fn)];
-    });
+    }
     Object.assign(global, old_globals);
     old_globals = {};
     for (const name of new_globals) {
diff --git a/frontend_tests/zjsunit/zjquery.js b/frontend_tests/zjsunit/zjquery.js
index 3ece134d58..cf4ce0e8bc 100644
--- a/frontend_tests/zjsunit/zjquery.js
+++ b/frontend_tests/zjsunit/zjquery.js
@@ -300,9 +300,9 @@ exports.make_new_elem = function (selector, opts) {
         },
         removeClass(class_names) {
             class_names = class_names.split(" ");
-            class_names.forEach((class_name) => {
+            for (const class_name of class_names) {
                 classes.delete(class_name);
-            });
+            }
             return self;
         },
         remove() {
diff --git a/static/js/billing/helpers.js b/static/js/billing/helpers.js
index 2435844620..06e63a873c 100644
--- a/static/js/billing/helpers.js
+++ b/static/js/billing/helpers.js
@@ -32,13 +32,13 @@ exports.create_ajax_request = function (
         data.stripe_token = JSON.stringify(stripe_token.id);
     }
 
-    form.serializeArray().forEach((item) => {
+    for (const item of form.serializeArray()) {
         if (numeric_inputs.includes(item.name)) {
             data[item.name] = item.value;
         } else {
             data[item.name] = JSON.stringify(item.value);
         }
-    });
+    }
 
     $.post({
         url,
diff --git a/static/js/color_data.js b/static/js/color_data.js
index e62eff0441..a0fa34125d 100644
--- a/static/js/color_data.js
+++ b/static/js/color_data.js
@@ -55,7 +55,9 @@ exports.claim_color = function (color) {
 
 exports.claim_colors = function (subs) {
     const colors = new Set(subs.map((sub) => sub.color));
-    colors.forEach(exports.claim_color);
+    for (const color of colors) {
+        exports.claim_color(color);
+    }
 };
 
 exports.pick_color = function () {
diff --git a/static/js/components.js b/static/js/components.js
index 7e44b97463..07058d92bc 100644
--- a/static/js/components.js
+++ b/static/js/components.js
@@ -20,7 +20,7 @@ exports.toggle = function (opts) {
             // classes need to be added for correct alignment or other purposes
             _component.addClass(opts.html_class);
         }
-        opts.values.forEach((value, i) => {
+        for (const [i, value] of opts.values.entries()) {
             // create a tab with a tab-id so they don't have to be referenced
             // by text value which can be inconsistent.
             const tab = $(
@@ -43,7 +43,7 @@ exports.toggle = function (opts) {
                 tab.addClass("middle");
             }
             _component.append(tab);
-        });
+        }
         return _component;
     })(opts);
 
diff --git a/static/js/debug.js b/static/js/debug.js
index 94b7b8bcc1..a32bc43231 100644
--- a/static/js/debug.js
+++ b/static/js/debug.js
@@ -23,7 +23,7 @@ export function check_duplicate_ids() {
     const collisions = [];
     let total_collisions = 0;
 
-    Array.prototype.slice.call(document.querySelectorAll("*")).forEach((o) => {
+    for (const o of Array.prototype.slice.call(document.querySelectorAll("*"))) {
         if (o.id && ids.has(o.id)) {
             const el = collisions.find((c) => c.id === o.id);
 
@@ -53,7 +53,7 @@ export function check_duplicate_ids() {
         } else if (o.id) {
             ids.add(o.id);
         }
-    });
+    }
 
     return {
         collisions,
diff --git a/static/js/emoji_picker.js b/static/js/emoji_picker.js
index decc522b4a..215a791661 100644
--- a/static/js/emoji_picker.js
+++ b/static/js/emoji_picker.js
@@ -546,11 +546,11 @@ exports.emoji_select_tab = function (elt) {
     const scrollheight = elt.prop("scrollHeight");
     const elt_height = elt.height();
     let currently_selected = "";
-    section_head_offsets.forEach((o) => {
+    for (const o of section_head_offsets) {
         if (scrolltop + elt_height / 2 >= o.position_y) {
             currently_selected = o.section;
         }
-    });
+    }
     // Handles the corner case of the last category being
     // smaller than half of the emoji picker height.
     if (elt_height + scrolltop === scrollheight) {
diff --git a/static/js/hotspots.js b/static/js/hotspots.js
index a926e69836..92c5901d95 100644
--- a/static/js/hotspots.js
+++ b/static/js/hotspots.js
@@ -235,7 +235,7 @@ function insert_hotspot_into_DOM(hotspot) {
         }
 
         // reposition on any event that might update the UI
-        ["resize", "scroll", "onkeydown", "click"].forEach((event_name) => {
+        for (const event_name of ["resize", "scroll", "onkeydown", "click"]) {
             window.addEventListener(
                 event_name,
                 _.debounce(() => {
@@ -245,7 +245,7 @@ function insert_hotspot_into_DOM(hotspot) {
                 }, 10),
                 true,
             );
-        });
+        }
     }, hotspot.delay * 1000);
 }
 
@@ -278,10 +278,10 @@ function close_read_hotspots(new_hotspots) {
 
 exports.load_new = function (new_hotspots) {
     close_read_hotspots(new_hotspots);
-    new_hotspots.forEach((hotspot) => {
+    for (const hotspot of new_hotspots) {
         hotspot.location = HOTSPOT_LOCATIONS.get(hotspot.name);
-    });
-    new_hotspots.forEach(insert_hotspot_into_DOM);
+        insert_hotspot_into_DOM(hotspot);
+    }
 };
 
 exports.initialize = function () {
diff --git a/static/js/input_pill.js b/static/js/input_pill.js
index a62fae7aef..0743503a68 100644
--- a/static/js/input_pill.js
+++ b/static/js/input_pill.js
@@ -198,15 +198,12 @@ exports.create = function (opts) {
 
             // this is an array to push all the errored values to, so it's drafts
             // of pills for the user to fix.
-            const drafts = [];
-
-            pills.forEach((pill) => {
-                // if this returns `false`, it erroed and we should push it to
-                // the draft pills.
-                if (funcs.appendPill(pill) === false) {
-                    drafts.push(pill);
-                }
-            });
+            const drafts = pills.filter(
+                (pill) =>
+                    // if this returns `false`, it erroed and we should push it to
+                    // the draft pills.
+                    funcs.appendPill(pill) === false,
+            );
 
             store.$input.text(drafts.join(", "));
             // when using the `text` insertion feature with jQuery the caret is
diff --git a/static/js/invite.js b/static/js/invite.js
index 9c453aeedf..7c1f92001b 100644
--- a/static/js/invite.js
+++ b/static/js/invite.js
@@ -76,14 +76,14 @@ function submit_invitation_form() {
                 const invitee_emails_errored = [];
                 const error_list = [];
                 let is_invitee_deactivated = false;
-                arr.errors.forEach((value) => {
+                for (const value of arr.errors) {
                     const [email, error_message, deactivated] = value;
                     error_list.push(`${email}: ${error_message}`);
                     if (deactivated) {
                         is_invitee_deactivated = true;
                     }
                     invitee_emails_errored.push(email);
-                });
+                }
 
                 const error_response = render_invitation_failed_error({
                     error_message: arr.msg,
diff --git a/static/js/lightbox.js b/static/js/lightbox.js
index d00954fbf2..2070eb51d7 100644
--- a/static/js/lightbox.js
+++ b/static/js/lightbox.js
@@ -12,7 +12,7 @@ function render_lightbox_list_images(preview_source) {
         const images = Array.prototype.slice.call($(".focused_table .message_inline_image img"));
         const $image_list = $("#lightbox_overlay .image-list").html("");
 
-        images.forEach((img) => {
+        for (const img of images) {
             const src = img.getAttribute("src");
             const className = preview_source === src ? "image selected" : "image";
 
@@ -28,7 +28,7 @@ function render_lightbox_list_images(preview_source) {
             // that navigating within the list only needs the `src`
             // attribute used to construct the node object above.
             exports.parse_image_data(img);
-        }, "");
+        }
     }
 }
 
diff --git a/static/js/localstorage.js b/static/js/localstorage.js
index 5196964661..d2c52123f8 100644
--- a/static/js/localstorage.js
+++ b/static/js/localstorage.js
@@ -68,9 +68,9 @@ const ls = {
         const key_regex = new RegExp(this.formGetter(version, regex));
         const keys = Object.keys(localStorage).filter((key) => key_regex.test(key));
 
-        keys.forEach((key) => {
+        for (const key of keys) {
             localStorage.removeItem(key);
-        });
+        }
     },
 
     // migrate from an older version of a data src to a newer one with a
diff --git a/static/js/message_fetch.js b/static/js/message_fetch.js
index bc1951a0e4..6e49325911 100644
--- a/static/js/message_fetch.js
+++ b/static/js/message_fetch.js
@@ -34,8 +34,10 @@ function process_result(data, opts) {
         narrow.show_empty_narrow_message();
     }
 
-    messages.forEach(message_store.set_message_booleans);
-    messages = messages.map(message_store.add_message_metadata);
+    messages = messages.map((message) => {
+        message_store.set_message_booleans(message);
+        return message_store.add_message_metadata(message);
+    });
 
     // In case any of the newly fetched messages are new, add them to
     // our unread data structures.  It's important that this run even
diff --git a/static/js/message_list_data.js b/static/js/message_list_data.js
index 5315db28a2..9c7a86a800 100644
--- a/static/js/message_list_data.js
+++ b/static/js/message_list_data.js
@@ -430,7 +430,7 @@ class MessageListData {
     }
 
     _add_to_hash(messages) {
-        messages.forEach((elem) => {
+        for (const elem of messages) {
             const id = Number.parseFloat(elem.id);
             if (Number.isNaN(id)) {
                 throw new TypeError("Bad message id");
@@ -440,10 +440,10 @@ class MessageListData {
             }
             if (this._hash.has(id)) {
                 blueslip.error("Duplicate message added to MessageListData");
-                return;
+                continue;
             }
             this._hash.set(id, elem);
-        });
+        }
     }
 
     _is_localonly_id(id) {
diff --git a/static/js/message_store.js b/static/js/message_store.js
index 0912678586..452cd075cc 100644
--- a/static/js/message_store.js
+++ b/static/js/message_store.js
@@ -43,7 +43,9 @@ exports.get = function get(message_id) {
 };
 
 exports.each = function (f) {
-    stored_messages.forEach(f);
+    for (const [id, message] of stored_messages) {
+        f(message, id);
+    }
 };
 
 exports.get_pm_emails = function (message) {
diff --git a/static/js/popovers.js b/static/js/popovers.js
index 07b5b1a700..b1858fc70e 100644
--- a/static/js/popovers.js
+++ b/static/js/popovers.js
@@ -897,10 +897,10 @@ exports.register_click_handlers = function () {
             const url_prefix = playground_info[0].url_prefix;
             view_in_playground_button.attr("href", url_prefix + encodeURIComponent(extracted_code));
         } else {
-            playground_info.forEach(($playground) => {
+            for (const $playground of playground_info) {
                 $playground.playground_url =
                     $playground.url_prefix + encodeURIComponent(extracted_code);
-            });
+            }
             exports.toggle_playground_link_popover(this, playground_info);
         }
     });
@@ -1309,11 +1309,11 @@ exports.hide_all_except_sidebars = function () {
     exports.hide_playground_links_popover();
 
     // look through all the popovers that have been added and removed.
-    list_of_popovers.forEach(($o) => {
+    for (const $o of list_of_popovers) {
         if (!document.body.contains($o.$element[0]) && $o.$tip) {
             $o.$tip.remove();
         }
-    });
+    }
     list_of_popovers = [];
 };
 
diff --git a/static/js/portico/integrations.js b/static/js/portico/integrations.js
index ad91048fa8..ca84e7bd6d 100644
--- a/static/js/portico/integrations.js
+++ b/static/js/portico/integrations.js
@@ -11,27 +11,23 @@ const INTEGRATIONS = new Map();
 const CATEGORIES = new Map();
 
 function load_data() {
-    $(".integration-lozenge")
-        .toArray()
-        .forEach((integration) => {
-            const name = $(integration).data("name");
-            const display_name = $(integration).find(".integration-name").text().trim();
+    for (const integration of $(".integration-lozenge")) {
+        const name = $(integration).data("name");
+        const display_name = $(integration).find(".integration-name").text().trim();
 
-            if (display_name && name) {
-                INTEGRATIONS.set(name, display_name);
-            }
-        });
+        if (display_name && name) {
+            INTEGRATIONS.set(name, display_name);
+        }
+    }
 
-    $(".integration-category")
-        .toArray()
-        .forEach((category) => {
-            const name = $(category).data("category");
-            const display_name = $(category).text().trim();
+    for (const category of $(".integration-category")) {
+        const name = $(category).data("category");
+        const display_name = $(category).text().trim();
 
-            if (display_name && name) {
-                CATEGORIES.set(name, display_name);
-            }
-        });
+        if (display_name && name) {
+            CATEGORIES.set(name, display_name);
+        }
+    }
 }
 
 const INITIAL_STATE = {
@@ -43,27 +39,25 @@ const INITIAL_STATE = {
 let state = {...INITIAL_STATE};
 
 function adjust_font_sizing() {
-    $(".integration-lozenge")
-        .toArray()
-        .forEach((integration) => {
-            const $integration_name = $(integration).find(".integration-name");
-            const $integration_category = $(integration).find(".integration-category");
+    for (const integration of $(".integration-lozenge")) {
+        const $integration_name = $(integration).find(".integration-name");
+        const $integration_category = $(integration).find(".integration-category");
 
-            // if the text has wrapped to two lines, decrease font-size
+        // if the text has wrapped to two lines, decrease font-size
+        if ($integration_name.height() > 30) {
+            $integration_name.css("font-size", "1em");
             if ($integration_name.height() > 30) {
-                $integration_name.css("font-size", "1em");
-                if ($integration_name.height() > 30) {
-                    $integration_name.css("font-size", ".95em");
-                }
+                $integration_name.css("font-size", ".95em");
             }
+        }
 
+        if ($integration_category.height() > 30) {
+            $integration_category.css("font-size", ".8em");
             if ($integration_category.height() > 30) {
-                $integration_category.css("font-size", ".8em");
-                if ($integration_category.height() > 30) {
-                    $integration_category.css("font-size", ".75em");
-                }
+                $integration_category.css("font-size", ".75em");
             }
-        });
+        }
+    }
 }
 
 function update_path() {
@@ -105,8 +99,7 @@ function update_categories() {
 const update_integrations = _.debounce(() => {
     const max_scrollY = window.scrollY;
 
-    const integrations = $(".integration-lozenges").children().toArray();
-    integrations.forEach((integration) => {
+    for (const integration of $(".integration-lozenges").children()) {
         const $integration = $(integration).find(".integration-lozenge");
         const $integration_category = $integration.find(".integration-category");
 
@@ -133,7 +126,7 @@ const update_integrations = _.debounce(() => {
         }
 
         document.body.scrollTop = Math.min(window.scrollY, max_scrollY);
-    });
+    }
 
     adjust_font_sizing();
 }, 50);
@@ -151,7 +144,7 @@ function hide_catalog_show_integration() {
     function show_integration(doc) {
         $("#integration-instructions-group .name").text(INTEGRATIONS.get(state.integration));
         $("#integration-instructions-group .categories .integration-category").remove();
-        categories.forEach((category) => {
+        for (const category of categories) {
             let link;
             for (const [name, display_name] of CATEGORIES) {
                 if (display_name === category) {
@@ -163,7 +156,7 @@ function hide_catalog_show_integration() {
                 .append('<h3 class="integration-category"></h3>');
             category_el.find(".integration-category").attr("data-category", link).text(category);
             $("#integration-instructions-group .categories").append(category_el);
-        });
+        }
         $("#integration-instructions-group").css({
             opacity: 0,
             display: "flex",
@@ -305,9 +298,8 @@ function toggle_categories_dropdown() {
 
 function integration_events() {
     $('#integration-search input[type="text"]').on("keypress", (e) => {
-        const integrations = $(".integration-lozenges").children().toArray();
         if (e.which === 13 && e.target.value !== "") {
-            for (const integration_element of integrations) {
+            for (const integration_element of $(".integration-lozenges").children()) {
                 const integration = $(integration_element).find(".integration-lozenge");
 
                 if ($(integration).css("display") !== "none") {
diff --git a/static/js/portico/integrations_dev_panel.js b/static/js/portico/integrations_dev_panel.js
index ef56a5d702..410ec02161 100644
--- a/static/js/portico/integrations_dev_panel.js
+++ b/static/js/portico/integrations_dev_panel.js
@@ -38,7 +38,7 @@ const clear_handlers = {
 function clear_elements(elements) {
     // Supports strings (a selector to clear) or calling a function
     // (for more complex logic).
-    elements.forEach((element_name) => {
+    for (const element_name of elements) {
         const handler = clear_handlers[element_name];
         if (typeof handler === "string") {
             const element_object = $(handler)[0];
@@ -47,7 +47,7 @@ function clear_elements(elements) {
         } else {
             handler();
         }
-    });
+    }
     return;
 }
 
@@ -102,7 +102,7 @@ function set_results(response) {
     const responses = response.responses;
 
     let data = "Results:\n\n";
-    responses.forEach((response) => {
+    for (const response of responses) {
         if (response.fixture_name !== undefined) {
             data += "Fixture:            " + response.fixture_name;
             data += "\nStatus Code:    " + response.status_code;
@@ -110,7 +110,7 @@ function set_results(response) {
             data += "Status Code:    " + response.status_code;
         }
         data += "\nResponse:       " + response.message + "\n\n";
-    });
+    }
     $("#idp-results")[0].value = data;
 }
 
@@ -142,12 +142,12 @@ function load_fixture_options(integration_name) {
     const fixtures_options_dropdown = $("#fixture_name")[0];
     const fixtures_names = Object.keys(loaded_fixtures.get(integration_name)).sort();
 
-    fixtures_names.forEach((fixture_name) => {
+    for (const fixture_name of fixtures_names) {
         const new_dropdown_option = document.createElement("option");
         new_dropdown_option.value = fixture_name;
         new_dropdown_option.innerHTML = fixture_name;
         fixtures_options_dropdown.add(new_dropdown_option);
-    });
+    }
     load_fixture_body(fixtures_names[0]);
 
     return;
diff --git a/static/js/portico/landing-page.js b/static/js/portico/landing-page.js
index 10dada3e22..bd0eef25fb 100644
--- a/static/js/portico/landing-page.js
+++ b/static/js/portico/landing-page.js
@@ -79,11 +79,11 @@ const apps_events = function () {
         let result;
         const parts = path_parts();
 
-        Object.keys(info).forEach((version) => {
+        for (const version of Object.keys(info)) {
             if (parts.includes(version)) {
                 result = version;
             }
-        });
+        }
 
         result = result || detect_user_os();
         return result;
diff --git a/static/js/portico/team.js b/static/js/portico/team.js
index 8a798a2511..e142cb0607 100644
--- a/static/js/portico/team.js
+++ b/static/js/portico/team.js
@@ -20,9 +20,9 @@ const loaded_repos = [];
 
 function calculate_total_commits(contributor) {
     let commits = 0;
-    Object.keys(repo_name_to_tab_name).forEach((repo_name) => {
+    for (const repo_name of Object.keys(repo_name_to_tab_name)) {
         commits += contributor[repo_name] || 0;
-    });
+    }
     return commits;
 }
 
diff --git a/static/js/server_events.js b/static/js/server_events.js
index 73b59a6435..9e8fc347d9 100644
--- a/static/js/server_events.js
+++ b/static/js/server_events.js
@@ -102,7 +102,9 @@ function get_events_success(events) {
         try {
             messages = echo.process_from_server(messages);
             if (messages.length > 0) {
-                messages.forEach(message_store.set_message_booleans);
+                for (const message of messages) {
+                    message_store.set_message_booleans(message);
+                }
 
                 const sent_by_this_client = messages.some((msg) =>
                     sent_messages.messages.has(msg.local_id),
diff --git a/static/js/server_events_dispatch.js b/static/js/server_events_dispatch.js
index 8d64e57359..909824c7d9 100644
--- a/static/js/server_events_dispatch.js
+++ b/static/js/server_events_dispatch.js
@@ -345,42 +345,42 @@ exports.dispatch_normal_event = function dispatch_normal_event(event) {
                     }
                 }
             } else if (event.op === "peer_add") {
-                event.stream_ids.forEach((stream_id) => {
+                for (const stream_id of event.stream_ids) {
                     const sub = stream_data.get_sub_by_id(stream_id);
 
                     if (!sub) {
                         blueslip.warn("Cannot find stream for peer_add: " + stream_id);
-                        return;
+                        continue;
                     }
 
-                    event.user_ids.forEach((user_id) => {
+                    for (const user_id of event.user_ids) {
                         if (!peer_data.add_subscriber(stream_id, user_id)) {
                             blueslip.warn("Cannot process peer_add event");
-                            return;
+                            continue;
                         }
-                    });
+                    }
 
                     subs.update_subscribers_ui(sub);
-                });
+                }
                 compose_fade.update_faded_users();
             } else if (event.op === "peer_remove") {
-                event.stream_ids.forEach((stream_id) => {
+                for (const stream_id of event.stream_ids) {
                     const sub = stream_data.get_sub_by_id(stream_id);
 
                     if (!sub) {
                         blueslip.warn("Cannot find stream for peer_remove: " + stream_id);
-                        return;
+                        continue;
                     }
 
-                    event.user_ids.forEach((user_id) => {
+                    for (const user_id of event.user_ids) {
                         if (!peer_data.remove_subscriber(sub.stream_id, user_id)) {
                             blueslip.warn("Cannot process peer_remove event.");
-                            return;
+                            continue;
                         }
-                    });
+                    }
 
                     subs.update_subscribers_ui(sub);
-                });
+                }
                 compose_fade.update_faded_users();
             } else if (event.op === "remove") {
                 for (const rec of event.subscriptions) {
diff --git a/static/js/settings_account.js b/static/js/settings_account.js
index ec2e064e6e..17c8a93791 100644
--- a/static/js/settings_account.js
+++ b/static/js/settings_account.js
@@ -146,7 +146,7 @@ exports.append_custom_profile_fields = function (element_id, user_id) {
         [all_field_types.URL.id, "url"],
     ]);
 
-    all_custom_fields.forEach((field) => {
+    for (const field of all_custom_fields) {
         let field_value = people.get_custom_profile_data(user_id, field.id);
         const is_choice_field = field.type === all_field_types.CHOICE.id;
         const field_choices = [];
@@ -178,7 +178,7 @@ exports.append_custom_profile_fields = function (element_id, user_id) {
             field_choices,
         });
         $(element_id).append(html);
-    });
+    }
 };
 
 exports.initialize_custom_date_type_fields = function (element_id) {
@@ -219,7 +219,7 @@ exports.initialize_custom_user_type_fields = function (
         return user_pills;
     }
 
-    page_params.custom_profile_fields.forEach((field) => {
+    for (const field of page_params.custom_profile_fields) {
         let field_value_raw = people.get_custom_profile_data(user_id, field.id);
 
         if (field_value_raw) {
@@ -249,10 +249,10 @@ exports.initialize_custom_user_type_fields = function (
             if (field_value_raw) {
                 const field_value = JSON.parse(field_value_raw);
                 if (field_value) {
-                    field_value.forEach((pill_user_id) => {
+                    for (const pill_user_id of field_value) {
                         const user = people.get_by_user_id(pill_user_id);
                         user_pill.append_user(user, pills);
-                    });
+                    }
                 }
             }
 
@@ -270,7 +270,7 @@ exports.initialize_custom_user_type_fields = function (
             }
             user_pills.set(field.id, pills);
         }
-    });
+    }
 
     return user_pills;
 };
diff --git a/static/js/settings_org.js b/static/js/settings_org.js
index 877d946912..d91a95452d 100644
--- a/static/js/settings_org.js
+++ b/static/js/settings_org.js
@@ -644,7 +644,9 @@ exports.build_page = function () {
     // Populate authentication methods table
     exports.populate_auth_methods(page_params.realm_authentication_methods);
 
-    simple_dropdown_properties.forEach(set_property_dropdown_value);
+    for (const property_name of simple_dropdown_properties) {
+        set_property_dropdown_value(property_name);
+    }
 
     set_realm_waiting_period_dropdown();
     set_video_chat_provider_dropdown();
@@ -684,7 +686,9 @@ exports.build_page = function () {
         (e) => {
             e.preventDefault();
             e.stopPropagation();
-            get_subsection_property_elements(e.target).forEach(discard_property_element_changes);
+            for (const elem of get_subsection_property_elements(e.target)) {
+                discard_property_element_changes(elem);
+            }
             const save_btn_controls = $(e.target).closest(".save-button-controls");
             exports.change_save_button_state(save_btn_controls, "discarded");
         },
diff --git a/static/js/settings_user_groups.js b/static/js/settings_user_groups.js
index 4d7f19ae1c..69dedf5493 100644
--- a/static/js/settings_user_groups.js
+++ b/static/js/settings_user_groups.js
@@ -65,10 +65,10 @@ exports.populate_user_groups = function () {
         }
 
         const userg = $('div.user-group[id="' + data.id + '"]');
-        data.members.forEach((user_id) => {
+        for (const user_id of data.members) {
             const user = people.get_by_user_id(user_id);
             user_pill.append_user(user, pills);
-        });
+        }
 
         function update_membership(group_id) {
             if (exports.can_edit(group_id)) {
diff --git a/static/js/stats/stats.js b/static/js/stats/stats.js
index 6fba87703f..0b67ce02bb 100644
--- a/static/js/stats/stats.js
+++ b/static/js/stats/stats.js
@@ -183,9 +183,9 @@ function populate_messages_sent_over_time(data) {
             document.querySelector("#hover_date").textContent =
                 data.points[0].data.text[data.points[0].pointNumber];
             const values = [null, null, null];
-            data.points.forEach((trace) => {
+            for (const trace of data.points) {
                 values[trace.curveNumber] = trace.y;
-            });
+            }
             const hover_text_ids = ["#hover_me", "#hover_human", "#hover_bot"];
             const hover_value_ids = ["#hover_me_value", "#hover_human_value", "#hover_bot_value"];
             for (const [i, value] of values.entries()) {
@@ -391,14 +391,14 @@ function compute_summary_chart_data(time_series_data, num_steps, labels_) {
     }
     const labels = labels_.slice();
     const values = [];
-    labels.forEach((label) => {
+    for (const label of labels) {
         if (data.has(label)) {
             values.push(data.get(label));
             data.delete(label);
         } else {
             values.push(0);
         }
-    });
+    }
     if (data.size !== 0) {
         labels[labels.length - 1] = "Other";
         for (const sum of data.values()) {
@@ -443,9 +443,9 @@ function populate_messages_sent_by_client(data) {
     }
     label_values.sort((a, b) => b.value - a.value);
     const labels = [];
-    label_values.forEach((item) => {
+    for (const item of label_values) {
         labels.push(item.label);
-    });
+    }
 
     function make_plot_data(time_series_data, num_steps) {
         const plot_data = compute_summary_chart_data(time_series_data, num_steps, labels);
@@ -732,9 +732,9 @@ function populate_number_of_users(data) {
             document.querySelector("#users_hover_date").textContent =
                 data.points[0].data.text[data.points[0].pointNumber];
             const values = [null, null, null];
-            data.points.forEach((trace) => {
+            for (const trace of data.points) {
                 values[trace.curveNumber] = trace.y;
-            });
+            }
             const hover_value_ids = [
                 "#users_hover_1day_value",
                 "#users_hover_15day_value",
@@ -865,9 +865,9 @@ function populate_messages_read_over_time(data) {
             document.querySelector("#read_hover_date").textContent =
                 data.points[0].data.text[data.points[0].pointNumber];
             const values = [null, null];
-            data.points.forEach((trace) => {
+            for (const trace of data.points) {
                 values[trace.curveNumber] = trace.y;
-            });
+            }
             const read_hover_text_ids = ["#read_hover_me", "#read_hover_everyone"];
             const read_hover_value_ids = ["#read_hover_me_value", "#read_hover_everyone_value"];
             for (const [i, value] of values.entries()) {
diff --git a/static/js/stream_data.js b/static/js/stream_data.js
index d6680d23ed..312d7c802b 100644
--- a/static/js/stream_data.js
+++ b/static/js/stream_data.js
@@ -602,9 +602,9 @@ exports.all_topics_in_cache = function (sub) {
 exports.set_realm_default_streams = function (realm_default_streams) {
     default_stream_ids.clear();
 
-    realm_default_streams.forEach((stream) => {
+    for (const stream of realm_default_streams) {
         default_stream_ids.add(stream.stream_id);
-    });
+    }
 };
 
 exports.get_default_stream_ids = function () {
@@ -903,12 +903,12 @@ exports.initialize = function (params) {
     color_data.claim_colors(subscriptions);
 
     function populate_subscriptions(subs, subscribed, previously_subscribed) {
-        subs.forEach((sub) => {
+        for (const sub of subs) {
             sub.subscribed = subscribed;
             sub.previously_subscribed = previously_subscribed;
 
             exports.create_sub_from_server_data(sub);
-        });
+        }
     }
 
     exports.set_realm_default_streams(realm_default_streams);
diff --git a/static/js/stream_list.js b/static/js/stream_list.js
index 3086041059..72e8658e43 100644
--- a/static/js/stream_list.js
+++ b/static/js/stream_list.js
@@ -114,7 +114,9 @@ exports.build_stream_list = function (force_rerender) {
     topic_list.clear();
     parent.empty();
 
-    stream_groups.pinned_streams.forEach(add_sidebar_li);
+    for (const stream_id of stream_groups.pinned_streams) {
+        add_sidebar_li(stream_id);
+    }
 
     const any_pinned_streams = stream_groups.pinned_streams.length > 0;
     const any_normal_streams = stream_groups.normal_streams.length > 0;
@@ -124,13 +126,17 @@ exports.build_stream_list = function (force_rerender) {
         elems.push('<hr class="stream-split">');
     }
 
-    stream_groups.normal_streams.forEach(add_sidebar_li);
+    for (const stream_id of stream_groups.normal_streams) {
+        add_sidebar_li(stream_id);
+    }
 
     if (any_dormant_streams && any_normal_streams) {
         elems.push('<hr class="stream-split">');
     }
 
-    stream_groups.dormant_streams.forEach(add_sidebar_li);
+    for (const stream_id of stream_groups.dormant_streams) {
+        add_sidebar_li(stream_id);
+    }
 
     parent.append(elems);
 };
diff --git a/static/js/upload.js b/static/js/upload.js
index c0a4ae5a45..219e95c3b6 100644
--- a/static/js/upload.js
+++ b/static/js/upload.js
@@ -136,13 +136,13 @@ exports.upload_files = function (uppy, config, files) {
         .show();
     exports.get_item("send_status_message", config).html($("<p>").text(i18n.t("Uploading…")));
     exports.get_item("send_status_close_button", config).one("click", () => {
-        uppy.getFiles().forEach((file) => {
+        for (const file of uppy.getFiles()) {
             compose_ui.replace_syntax(
                 exports.get_translated_status(file),
                 "",
                 exports.get_item("textarea", config),
             );
-        });
+        }
         compose_ui.autosize_textarea(exports.get_item("textarea", config));
         uppy.cancelAll();
         exports.get_item("textarea", config).trigger("focus");
@@ -261,7 +261,7 @@ exports.setup_upload = function (config) {
 
     uppy.on("complete", () => {
         let uploads_in_progress = false;
-        uppy.getFiles().forEach((file) => {
+        for (const file of uppy.getFiles()) {
             if (file.progress.uploadComplete) {
                 // The uploaded files should be removed since uppy don't allow files in the store
                 // to be re-uploaded again.
@@ -272,7 +272,7 @@ exports.setup_upload = function (config) {
                 // still be in progress.
                 uploads_in_progress = true;
             }
-        });
+        }
 
         const has_errors = exports.get_item("send_status", config).hasClass("alert-error");
         if (!uploads_in_progress && !has_errors) {