dict: Remove Dict.from.

Signed-off-by: Anders Kaseorg <anders@zulipchat.com>

frontend_tests/node_tests/dict.js

@@ -85,7 +85,9 @@ run_test('construction', () => {
 
     assert.deepEqual(d1.items(), []);
 
-    const d2 = Dict.from({foo: 'bar', baz: 'qux'});
+    const d2 = new Dict();
+    d2.set('foo', 'bar');
+    d2.set('baz', 'qux');
     assert.deepEqual(d2.items(), [['foo', 'bar'], ['baz', 'qux']]);
 
     const d3 = d2.clone();
@@ -97,15 +99,6 @@ run_test('construction', () => {
     assert.deepEqual(d4.items(), [['foo', true], ['bar', true]]);
 
     let caught;
-    try {
-        Dict.from('bogus');
-    } catch (e) {
-        caught = true;
-        assert.equal(e.toString(), 'TypeError: Cannot convert argument to Dict');
-    }
-    assert(caught);
-
-    caught = undefined;
     try {
         Dict.from_array({bogus: true});
     } catch (e2) {

static/js/dict.ts

@@ -8,23 +8,6 @@ type Items<V> = {
 export class Dict<V> {
     private _items: Items<V> = {};
 
-    /**
-     * Constructs a Dict object from an existing object's keys and values.
-     * @param obj - A javascript object
-     */
-    static from<V>(obj: { [key: string]: V }): Dict<V> {
-        if (typeof obj !== "object" || obj === null) {
-            throw new TypeError("Cannot convert argument to Dict");
-        }
-
-        const dict = new Dict<V>();
-        _.each(obj, function (val: V, key: string) {
-            dict.set(key, val);
-        });
-
-        return dict;
-    }
-
     /**
      * Construct a Dict object from an array with each element set to `true`.
      * Intended for use as a set data structure.