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20 lines
486 B
20 lines
486 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('../helpers/isFinite');
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// https://262.ecma-international.org/14.0/#sec-toint8
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module.exports = function ToInt8(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 int8bit = modulo(int, 0x100);
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return int8bit >= 0x80 ? int8bit - 0x100 : int8bit;
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};
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