66 lines
1.4 KiB
Plaintext
66 lines
1.4 KiB
Plaintext
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'use strict';
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var GetIntrinsic = require('get-intrinsic');
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var $TypeError = GetIntrinsic('%TypeError%');
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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 Type = require('./Type');
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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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var xType = Type(x);
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var yType = Type(y);
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if (xType !== yType || (xType !== 'BigInt' && xType !== 'Number')) {
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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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