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39 lines
1.2 KiB
JavaScript
39 lines
1.2 KiB
JavaScript
6 years ago
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// async-each MIT license (by Paul Miller from https://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') 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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if (items.length === 0) return callback(undefined, items);
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var transformed = new Array(items.length);
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var count = 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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count += 1;
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if (count === items.length) 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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