23 lines
555 B
JavaScript
23 lines
555 B
JavaScript
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var hasOwn = Object.prototype.hasOwnProperty;
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var toString = Object.prototype.toString;
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module.exports = function forEach (obj, fn, ctx) {
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if (toString.call(fn) !== '[object Function]') {
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throw new TypeError('iterator must be a function');
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}
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var l = obj.length;
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if (l === +l) {
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for (var i = 0; i < l; i++) {
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fn.call(ctx, obj[i], i, obj);
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}
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} else {
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for (var k in obj) {
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if (hasOwn.call(obj, k)) {
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fn.call(ctx, obj[k], k, obj);
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}
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}
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}
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};
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