61 lines
1.3 KiB
JavaScript
61 lines
1.3 KiB
JavaScript
'use strict';
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var $TypeError = require('es-errors/type');
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var Call = require('./Call');
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var SameValue = require('./SameValue');
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var ToNumber = require('./ToNumber');
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var isNaN = require('../helpers/isNaN');
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// https://262.ecma-international.org/14.0/#sec-comparetypedarrayelements
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module.exports = function CompareTypedArrayElements(x, y, compareFn) {
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if ((typeof x !== 'number' && typeof x !== 'bigint') || typeof x !== typeof y) {
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throw new $TypeError('Assertion failed: `x` and `y` must be either a BigInt or a Number, and both must be the same type');
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}
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if (typeof compareFn !== 'function' && typeof compareFn !== 'undefined') {
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throw new $TypeError('Assertion failed: `compareFn` must be a function or undefined');
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}
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if (typeof compareFn !== 'undefined') { // step 2
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var v = ToNumber(Call(compareFn, void undefined, [x, y])); // step 2.a
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if (isNaN(v)) {
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return 0; // step 2.b
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}
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return v; // step 2.c
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}
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var xNaN = isNaN(x);
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var yNaN = isNaN(y);
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if (xNaN && yNaN) {
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return 0; // step 3
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}
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if (xNaN) {
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return 1; // step 4
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}
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if (yNaN) {
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return -1; // step 5
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}
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if (x < y) {
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return -1; // step 6
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}
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if (x > y) {
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return 1; // step 7
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}
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if (SameValue(x, -0) && SameValue(y, 0)) {
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return -1; // step 8
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}
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if (SameValue(x, 0) && SameValue(y, -0)) {
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return 1; // step 9
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}
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return 0; // step 10
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};
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