1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
|
// Copyright (c) 2012 Ecma International. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es5id: 15.4.4.21-9-c-ii-5
description: >
Array.prototype.reduce - k values are accessed during each
iteration and not prior to starting the loop on an Array
includes: [runTestCase.js]
---*/
function testcase() {
var result = true;
var kIndex = [];
var called = 0;
//By below way, we could verify that k would be setted as 0, 1, ..., length - 1 in order, and each value will be setted one time.
function callbackfn(prevVal, curVal, idx, obj) {
//Each position should be visited one time, which means k is accessed one time during iterations.
called++;
if (typeof kIndex[idx] === "undefined") {
//when current position is visited, its previous index should has been visited.
if (idx !== 0 && typeof kIndex[idx - 1] === "undefined") {
result = false;
}
kIndex[idx] = 1;
} else {
result = false;
}
}
[11, 12, 13, 14].reduce(callbackfn, 1);
return result && called === 4;
}
runTestCase(testcase);
|