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