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