| 'use strict'; |
| |
| var modulo = require('./modulo'); |
| var ToNumber = require('./ToNumber'); |
| var truncate = require('./truncate'); |
| |
| var isFinite = require('math-intrinsics/isFinite'); |
| |
| // https://262.ecma-international.org/14.0/#sec-toint32 |
| |
| var two31 = 0x80000000; // Math.pow(2, 31); |
| var two32 = 0x100000000; // Math.pow(2, 32); |
| |
| module.exports = function ToInt32(argument) { |
| var number = ToNumber(argument); |
| if (!isFinite(number) || number === 0) { |
| return 0; |
| } |
| var int = truncate(number); |
| var int32bit = modulo(int, two32); |
| var result = int32bit >= two31 ? int32bit - two32 : int32bit; |
| return result === 0 ? 0 : result; // in the spec, these are math values, so we filter out -0 here |
| }; |