var getKeys = require('./_object-keys'); | |
var toIObject = require('./_to-iobject'); | |
module.exports = function (object, el) { | |
var O = toIObject(object); | |
var keys = getKeys(O); | |
var length = keys.length; | |
var index = 0; | |
var key; | |
while (length > index) if (O[key = keys[index++]] === el) return key; | |
}; |