9 examples of 'javascript iterate over map' in JavaScript

29
(function TestForEachNoValue() {
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  res = "c) ";
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  var myMap = new Map([['key1', ''], ['key2',], ['key3', undefined], ['key4', null]]);
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  myMap.forEach(logElement);
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  assertEquals("c) map[key1] = '' map[key2] = 'undefined' map[key3] = 'undefined' map[key4] = 'null' ", res);
35
})();

7
function mapIteratee(call_order, x, callback) {
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    setTimeout(() => {
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        call_order.push(x);
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        callback(null, x * 2);
11
    }, x * 25);
12
}

28
export function map(dict: Dictionary, callback: (item: T, key: string) =&gt; U, scope?: any): Dictionary<u> {
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	if (!dict) {
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		return null;
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	}
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	const result: Dictionary<u> = {};
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	every(dict, function (item: T, key: string): boolean {
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		result[key] = callback.call(scope, item, key);
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		return true;
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	});
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	return result;
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}</u></u>

16
export default function mapObject(obj: Record, iteratee: Iteratee) {
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  const keys = Object.keys(obj);
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  const mappedObject = {};
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  keys.forEach(key => {
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    mappedObject[key] = iteratee(obj[key], key);
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  });
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  return mappedObject;
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}

6
export function forEach (fn: KeyedFilterFn, map: SortedMapStructure): SortedMapStructure {
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  var it = iterate(map);
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  var current: IteratorResult, V>>;
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  var index = 0;
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  while(!(current = it.next()).done) {
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    var entry = current.value;
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    var signal = fn(entry.value, entry.key.key, index++);
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    if(signal === false) break;
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  }
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  return map;
16
}

64
function map(set, iterator, context, callback) {
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    if (typeof context === "function") {
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        callback = context;
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        context = undefined;
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    }
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    var keys = Object.keys(set),
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        result = Array.isArray(set) ? [] : {},
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        next = after(keys.length, callCallback);
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    keys.forEach(proxyIterator);
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    function proxyIterator(keyName) {
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        iterator.call(context, set[keyName], keyName, proxyCallback);
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        function proxyCallback(err, value) {
80
            if (err) {
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                return next(err);
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            }
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            result[keyName] = value;
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            next();
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        }
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    }
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    function callCallback(err) {
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        if (err) {
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            return callback(err);
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        }
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        callback(null, result);
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    }
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}

74
value: function map(obj, fn) {
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	var mappedObj = {};
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	var keys = Object.keys(obj);
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	for (var i = 0; i < keys.length; i++) {
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		mappedObj[keys[i]] = fn(keys[i], obj[keys[i]]);
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	}
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	return mappedObj;
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}

858
static forEach(map, f) {
859
  for (let k of map.keys) {
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    dart.dcall(f, k, map.get(k));
861
  }
862
}

291
function mapObject(obj, iteratee)
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{
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    var newObj = {};
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    each(obj, function (val, key)
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    {
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        var pair = iteratee(key, val);
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        newObj[pair[0]] = pair[1];
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    });
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    return newObj;
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}