41 lines
1.0 KiB
JavaScript
41 lines
1.0 KiB
JavaScript
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var hasOwn = Object.prototype.hasOwnProperty;
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var toString = Object.prototype.toString;
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var isFunction = function (fn) {
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var isFunc = (typeof fn === 'function' && !(fn instanceof RegExp)) || toString.call(fn) === '[object Function]';
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if (!isFunc && typeof window !== 'undefined') {
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isFunc = fn === window.setTimeout || fn === window.alert || fn === window.confirm || fn === window.prompt;
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}
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return isFunc;
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};
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module.exports = function forEach(obj, fn) {
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if (!isFunction(fn)) {
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throw new TypeError('iterator must be a function');
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}
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var i, k,
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isString = typeof obj === 'string',
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l = obj.length,
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context = arguments.length > 2 ? arguments[2] : null;
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if (l === +l) {
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for (i = 0; i < l; i++) {
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if (context === null) {
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fn(isString ? obj.charAt(i) : obj[i], i, obj);
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} else {
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fn.call(context, isString ? obj.charAt(i) : obj[i], i, obj);
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}
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}
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} else {
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for (k in obj) {
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if (hasOwn.call(obj, k)) {
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if (context === null) {
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fn(obj[k], k, obj);
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} else {
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fn.call(context, obj[k], k, obj);
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}
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}
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}
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}
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};
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