9 examples of 'javascript iterate over map' in JavaScript

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29(function TestForEachNoValue() {
30 res = "c) ";
31 var myMap = new Map([['key1', ''], ['key2',], ['key3', undefined], ['key4', null]]);
32 myMap.forEach(logElement);
33
34 assertEquals("c) map[key1] = '' map[key2] = 'undefined' map[key3] = 'undefined' map[key4] = 'null' ", res);
35})();
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7function mapIteratee(call_order, x, callback) {
8 setTimeout(() => {
9 call_order.push(x);
10 callback(null, x * 2);
11 }, x * 25);
12}
28export function map<T, U>(dict: Dictionary<T>, callback: (item: T, key: string) => U, scope?: any): Dictionary<U> {
29 if (!dict) {
30 return null;
31 }
32 const result: Dictionary<U> = {};
33 every(dict, function (item: T, key: string): boolean {
34 result[key] = callback.call(scope, item, key);
35 return true;
36 });
37 return result;
38}
16export default function mapObject(obj: Record<string, any>, iteratee: Iteratee) {
17 const keys = Object.keys(obj);
18 const mappedObject = {};
19
20 keys.forEach(key => {
21 mappedObject[key] = iteratee(obj[key], key);
22 });
23
24 return mappedObject;
25}
6export function forEach<K, V, U = any> (fn: KeyedFilterFn<V, K>, map: SortedMapStructure<K, V, U>): SortedMapStructure<K, V, U> {
7 var it = iterate(map);
8 var current: IteratorResult<RedBlackTreeEntry<SortingKey<K, U>, V>>;
9 var index = 0;
10 while(!(current = it.next()).done) {
11 var entry = current.value;
12 var signal = fn(entry.value, entry.key.key, index++);
13 if(signal === false) break;
14 }
15 return map;
16}
64function map(set, iterator, context, callback) {
65 if (typeof context === "function") {
66 callback = context;
67 context = undefined;
68 }
69
70 var keys = Object.keys(set),
71 result = Array.isArray(set) ? [] : {},
72 next = after(keys.length, callCallback);
73
74 keys.forEach(proxyIterator);
75
76 function proxyIterator(keyName) {
77 iterator.call(context, set[keyName], keyName, proxyCallback);
78
79 function proxyCallback(err, value) {
80 if (err) {
81 return next(err);
82 }
83 result[keyName] = value;
84 next();
85 }
86 }
87
88 function callCallback(err) {
89 if (err) {
90 return callback(err);
91 }
92 callback(null, result);
93 }
94}
74value: function map(obj, fn) {
75 var mappedObj = {};
76 var keys = Object.keys(obj);
77 for (var i = 0; i < keys.length; i++) {
78 mappedObj[keys[i]] = fn(keys[i], obj[keys[i]]);
79 }
80 return mappedObj;
81}
858static forEach(map, f) {
859 for (let k of map.keys) {
860 dart.dcall(f, k, map.get(k));
861 }
862}
291function mapObject(obj, iteratee)
292{
293 var newObj = {};
294
295 each(obj, function (val, key)
296 {
297 var pair = iteratee(key, val);
298
299 newObj[pair[0]] = pair[1];
300 });
301
302 return newObj;
303}

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