10 examples of 'node js async each' in JavaScript

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133function eachAsync(arr, eachFn, callback) {
134 arr = arr || [];
135
136 let idx = 0;
137 let awaiting = 0;
138 for (idx = 0; idx < arr.length; ++idx) {
139 awaiting++;
140 eachFn(arr[idx], eachCallback);
141 }
142
143 if (awaiting === 0) {
144 callback();
145 return;
146 }
147
148 function eachCallback(err) {
149 awaiting--;
150 if (err) {
151 callback(err);
152 return;
153 }
154
155 if (idx === arr.length && awaiting <= 0) {
156 callback();
157 }
158 }
159}
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26async function asyncForEachAsync<T>(iterable: AsyncIterable<T>, func: AsyncIteratorFunction<T, any>): Promise<void> {
27 let index = 0;
28
29 for await (const item of iterable) {
30 const returnValue = func(item, index++);
31
32 if (returnValue instanceof Promise) {
33 await returnValue;
34 }
35 }
36}
149exports.async = function asyncFunction(iter) {
150 return new Promise((resolve, reject) => {
151 resume('next', undefined);
152 function resume(type, value) {
153 try {
154 let result = iter[type](value);
155 if (result.done) {
156 resolve(result.value);
157 } else {
158 Promise.resolve(result.value).then(
159 x => resume('next', x),
160 x => resume('throw', x));
161 }
162 } catch (x) {
163 reject(x);
164 }
165 }
166 });
167};
78function eachAsync(arr, fn, finalFunc, chunkSize, i) {
79 i = i || 0;
80 chunkSize = chunkSize || CHUNK_SIZE;
81
82 var threshold = i + chunkSize,
83 proceed = true;
84
85 while (proceed && i < threshold && i < arr.length) {
86 proceed = fn(arr[i], i);
87 i = i + 1;
88 }
89 if (proceed) {
90 if (i < arr.length) {
91 setTimeout(function () {
92 eachAsync(arr, fn, finalFunc, chunkSize, i);
93 });
94 } else if (finalFunc) {
95 finalFunc();
96 }
97 }
98}
13function forEachAsync(arr, fn, thisArg) {
14 var result = PromiseA.resolve()
15 ;
16
17 arr.forEach(function (item, k) {
18 result = result.then(function () {
19
20 var ret
21 ;
22
23 if (thisArg) {
24 ret = fn.call(thisArg, item, k, arr);
25 } else {
26 ret = result = fn(item, k, arr);
27 }
28
29 if (!ret || !ret.then) {
30 ret = PromiseA.resolve(ret);
31 }
32
33 return ret.then(function (val) {
34 if (val === forEachAsync.__BREAK) {
35 return PromiseA.reject(new Error('break'));
36 //throw new Error('break');
37 }
38
39 return val;
40 });
41 });
42 });
43
44 result.catch(function (e) {
45 if ('break' !== e.message) {
46 throw e;
47 }
48 });
49
50 return result;
51}
12function AsyncIterator(array, step, start, end){
13 this.array = array;
14 this.currentIndex = -1;
15 this.stepFn = step || EmptyFunction;
16 this.startFn = start || EmptyFunction;
17 this.endFn = end || EmptyFunction;
18}
561function asyncForEach(array, handler, callback) {
562 var length = array.length,
563 index = -1;
564
565 function processNext(err) {
566 if (err) return callback(err);
567 index++;
568 if (index < length) {
569 handler(array[index], processNext, index);
570 }
571 else if (callback) {
572 typeof setImmediate === 'function' ? setImmediate(callback) : setTimeout(callback, 0);
573 }
574 }
575
576 processNext();
577}
163function asyncForEach(list, iterator, done) {
164 var i = 0;
165 function loop(error, index) {
166 if (index && index > i) {
167 i = index;
168 }
169 if (error || i >= list.length) {
170 done(error);
171 } else {
172 try {
173 iterator(list[i++], loop);
174 } catch (e) {
175 done(e);
176 }
177 }
178 }
179 loop();
180}
11function next() {
12
13 n--;
14 callback(target[n], n);
15 if(n) process.nextTick(next);
16}
47module.exports.eachSeries = function eachSeries(arr, fun) {
48 return arr.reduce((p, e) => p.then(() => fun(e)), Promise.resolve());
49};

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