40 lines
1.2 KiB
JavaScript
40 lines
1.2 KiB
JavaScript
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var baseTimes = require('./_baseTimes'),
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isArguments = require('./isArguments'),
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isArray = require('./isArray'),
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isIndex = require('./_isIndex');
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/** Used for built-in method references. */
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var objectProto = Object.prototype;
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/** Used to check objects for own properties. */
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var hasOwnProperty = objectProto.hasOwnProperty;
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/**
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* Creates an array of the enumerable property names of the array-like `value`.
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*
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* @private
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* @param {*} value The value to query.
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* @param {boolean} inherited Specify returning inherited property names.
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* @returns {Array} Returns the array of property names.
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*/
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function arrayLikeKeys(value, inherited) {
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// Safari 8.1 makes `arguments.callee` enumerable in strict mode.
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// Safari 9 makes `arguments.length` enumerable in strict mode.
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var result = (isArray(value) || isArguments(value))
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? baseTimes(value.length, String)
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: [];
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var length = result.length,
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skipIndexes = !!length;
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for (var key in value) {
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if ((inherited || hasOwnProperty.call(value, key)) &&
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!(skipIndexes && (key == 'length' || isIndex(key, length)))) {
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result.push(key);
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}
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}
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return result;
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}
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module.exports = arrayLikeKeys;
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