51 lines
1.2 KiB
JavaScript
51 lines
1.2 KiB
JavaScript
'use strict';
|
|
|
|
var $TypeError = require('es-errors/type');
|
|
|
|
var Call = require('./Call');
|
|
var IsLessThan = require('./IsLessThan');
|
|
var ToNumber = require('./ToNumber');
|
|
var ToString = require('./ToString');
|
|
|
|
var isNaN = require('math-intrinsics/isNaN');
|
|
|
|
// https://262.ecma-international.org/14.0/#sec-comparearrayelements
|
|
|
|
module.exports = function CompareArrayElements(x, y, compareFn) {
|
|
if (typeof compareFn !== 'function' && typeof compareFn !== 'undefined') {
|
|
throw new $TypeError('Assertion failed: `compareFn` must be a function or undefined');
|
|
}
|
|
|
|
if (typeof x === 'undefined' && typeof y === 'undefined') {
|
|
return 0; // step 1
|
|
}
|
|
|
|
if (typeof x === 'undefined') {
|
|
return 1; // step 2
|
|
}
|
|
|
|
if (typeof y === 'undefined') {
|
|
return -1; // step 3
|
|
}
|
|
|
|
if (typeof compareFn !== 'undefined') { // step 4
|
|
var v = ToNumber(Call(compareFn, void undefined, [x, y])); // step 4.a
|
|
if (isNaN(v)) {
|
|
return 0; // step 4.b
|
|
}
|
|
return v; // step 4.c
|
|
}
|
|
|
|
var xString = ToString(x); // step 5
|
|
var yString = ToString(y); // step 6
|
|
var xSmaller = IsLessThan(xString, yString, true); // step 7
|
|
if (xSmaller) {
|
|
return -1; // step 8
|
|
}
|
|
var ySmaller = IsLessThan(yString, xString, true); // step 9
|
|
if (ySmaller) {
|
|
return 1; // step 10
|
|
}
|
|
return 0; // step 11
|
|
};
|