| Leo Repp | 58b9f11 | 2021-11-22 11:57:47 +0100 | [diff] [blame^] | 1 | 'use strict'; |
| 2 | |
| 3 | var GetIntrinsic = require('get-intrinsic'); |
| 4 | |
| 5 | var $TypeError = GetIntrinsic('%TypeError%'); |
| 6 | |
| 7 | var SameValue = require('./SameValue'); |
| 8 | var ToNumber = require('./ToNumber'); |
| 9 | var ToString = require('./ToString'); |
| 10 | var Type = require('./Type'); |
| 11 | |
| 12 | // https://ecma-international.org/ecma-262/6.0/#sec-canonicalnumericindexstring |
| 13 | |
| 14 | module.exports = function CanonicalNumericIndexString(argument) { |
| 15 | if (Type(argument) !== 'String') { |
| 16 | throw new $TypeError('Assertion failed: `argument` must be a String'); |
| 17 | } |
| 18 | if (argument === '-0') { return -0; } |
| 19 | var n = ToNumber(argument); |
| 20 | if (SameValue(ToString(n), argument)) { return n; } |
| 21 | return void 0; |
| 22 | }; |