var toIntegerOrInfinity = require('../internals/to-integer-or-infinity'); var toLength = require('../internals/to-length'); var $RangeError = RangeError; // `ToIndex` abstract operation // https://tc39.es/ecma262/#sec-toindex module.exports = function (it) { if (it === undefined) return 0; var number = toIntegerOrInfinity(it); var length = toLength(number); if (number !== length) throw $RangeError('Wrong length or index'); return length; };