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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;
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