42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
var isArguments = require('../lang/isArguments'),
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isArray = require('../lang/isArray'),
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isIndex = require('./isIndex'),
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isLength = require('./isLength'),
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keysIn = require('../object/keysIn');
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/** Used for native 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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* A fallback implementation of `Object.keys` which creates an array of the
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* own enumerable property names of `object`.
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*
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* @private
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* @param {Object} object The object to query.
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* @returns {Array} Returns the array of property names.
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*/
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function shimKeys(object) {
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var props = keysIn(object),
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propsLength = props.length,
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length = propsLength && object.length;
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var allowIndexes = !!length && isLength(length) &&
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(isArray(object) || isArguments(object));
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var index = -1,
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result = [];
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while (++index < propsLength) {
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var key = props[index];
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if ((allowIndexes && isIndex(key, length)) || hasOwnProperty.call(object, key)) {
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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 = shimKeys;
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