1 var toInteger = require('../internals/to-integer');
2 var toLength = require('../internals/to-length');
4 // `ToIndex` abstract operation
5 // https://tc39.es/ecma262/#sec-toindex
6 module.exports = function (it) {
7 if (it === undefined) return 0;
8 var number = toInteger(it);
9 var length = toLength(number);
10 if (number !== length) throw RangeError('Wrong length or index');