24 lines
688 B
JavaScript
24 lines
688 B
JavaScript
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'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('../helpers/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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