40 lines
1.3 KiB
JavaScript
40 lines
1.3 KiB
JavaScript
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/*! async-each - MIT License (c) 2016 Paul Miller (paulmillr.com) */
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(function (globals) {
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'use strict';
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var each = function (items, next, callback) {
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if (!Array.isArray(items)) throw new TypeError('each() expects array as first argument');
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if (typeof next !== 'function')
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throw new TypeError('each() expects function as second argument');
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if (typeof callback !== 'function') callback = Function.prototype; // no-op
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var total = items.length;
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if (total === 0) return callback(undefined, items);
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var transformed = new Array(total);
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var transformedCount = 0;
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var returned = false;
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items.forEach(function (item, index) {
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next(item, function (error, transformedItem) {
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if (returned) return;
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if (error) {
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returned = true;
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return callback(error);
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}
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transformed[index] = transformedItem;
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transformedCount += 1; // can't use index: last item could take more time
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if (transformedCount === total) return callback(undefined, transformed);
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});
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});
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};
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if (typeof define !== 'undefined' && define.amd) {
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define([], function () {
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return each;
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}); // RequireJS
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} else if (typeof module !== 'undefined' && module.exports) {
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module.exports = each; // CommonJS
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} else {
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globals.asyncEach = each; // <script>
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}
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})(this);
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