30 lines
770 B
JavaScript
30 lines
770 B
JavaScript
|
'use strict';
|
||
|
|
|
||
|
|
var $TypeError = require('es-errors/type');
|
||
|
|
|
||
|
|
var isNaN = require('../../helpers/isNaN');
|
||
|
|
|
||
|
|
// https://262.ecma-international.org/11.0/#sec-numeric-types-number-multiply
|
||
|
|
|
||
|
|
module.exports = function NumberMultiply(x, y) {
|
||
|
|
if (typeof x !== 'number' || typeof y !== 'number') {
|
||
|
|
throw new $TypeError('Assertion failed: `x` and `y` arguments must be Numbers');
|
||
|
|
}
|
||
|
|
|
||
|
|
if (isNaN(x) || isNaN(y) || (x === 0 && !isFinite(y)) || (!isFinite(x) && y === 0)) {
|
||
|
|
return NaN;
|
||
|
|
}
|
||
|
|
if (!isFinite(x) && !isFinite(y)) {
|
||
|
|
return x === y ? Infinity : -Infinity;
|
||
|
|
}
|
||
|
|
if (!isFinite(x) && y !== 0) {
|
||
|
|
return x > 0 ? Infinity : -Infinity;
|
||
|
|
}
|
||
|
|
if (!isFinite(y) && x !== 0) {
|
||
|
|
return y > 0 ? Infinity : -Infinity;
|
||
|
|
}
|
||
|
|
|
||
|
|
// shortcut for the actual spec mechanics
|
||
|
|
return x * y;
|
||
|
|
};
|