51 lines
1.2 KiB
JavaScript
51 lines
1.2 KiB
JavaScript
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'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 IsLessThan = require('./IsLessThan');
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var ToNumber = require('./ToNumber');
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var ToString = require('./ToString');
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var isNaN = require('../helpers/isNaN');
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// https://262.ecma-international.org/14.0/#sec-comparearrayelements
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module.exports = function CompareArrayElements(x, y, compareFn) {
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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 x === 'undefined' && typeof y === 'undefined') {
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return 0; // step 1
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}
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if (typeof x === 'undefined') {
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return 1; // step 2
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}
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if (typeof y === 'undefined') {
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return -1; // step 3
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}
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if (typeof compareFn !== 'undefined') { // step 4
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var v = ToNumber(Call(compareFn, void undefined, [x, y])); // step 4.a
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if (isNaN(v)) {
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return 0; // step 4.b
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}
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return v; // step 4.c
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}
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var xString = ToString(x); // step 5
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var yString = ToString(y); // step 6
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var xSmaller = IsLessThan(xString, yString, true); // step 7
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if (xSmaller) {
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return -1; // step 8
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}
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var ySmaller = IsLessThan(yString, xString, true); // step 9
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if (ySmaller) {
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return 1; // step 10
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}
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return 0; // step 11
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};
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