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50 lines
1.7 KiB
JavaScript
50 lines
1.7 KiB
JavaScript
6 years ago
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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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isBuffer = require('./isBuffer'),
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isIndex = require('./_isIndex'),
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isTypedArray = require('./isTypedArray');
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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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var isArr = isArray(value),
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isArg = !isArr && isArguments(value),
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isBuff = !isArr && !isArg && isBuffer(value),
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isType = !isArr && !isArg && !isBuff && isTypedArray(value),
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skipIndexes = isArr || isArg || isBuff || isType,
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result = skipIndexes ? baseTimes(value.length, String) : [],
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length = result.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 && (
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// Safari 9 has enumerable `arguments.length` in strict mode.
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key == 'length' ||
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// Node.js 0.10 has enumerable non-index properties on buffers.
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(isBuff && (key == 'offset' || key == 'parent')) ||
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// PhantomJS 2 has enumerable non-index properties on typed arrays.
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(isType && (key == 'buffer' || key == 'byteLength' || key == 'byteOffset')) ||
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// Skip index properties.
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isIndex(key, length)
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))) {
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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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