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
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
|
// Copyright (C) 2016 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-%typedarray%.prototype.find
es6id: 22.2.3.10
description: >
Change values during predicate call
info: |
22.2.3.10 %TypedArray%.prototype.find (predicate [ , thisArg ] )
%TypedArray%.prototype.find is a distinct function that implements the same
algorithm as Array.prototype.find as defined in 22.1.3.8 except that the this
object's [[ArrayLength]] internal slot is accessed in place of performing a
[[Get]] of "length". The implementation of the algorithm may be optimized with
the knowledge that the this value is an object that has a fixed length and
whose integer indexed properties are not sparse.
...
22.1.3.8 Array.prototype.find ( predicate[ , thisArg ] )
...
4. If thisArg was supplied, let T be thisArg; else let T be undefined.
5. Let k be 0.
6. Repeat, while k < len
...
c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
...
includes: [compareArray.js, testTypedArray.js]
---*/
testWithTypedArrayConstructors(function(TA) {
var arr = [1, 2, 3];
var sample;
var result;
sample = new TA(3);
sample.find(function(val, i) {
sample[i] = arr[i];
assert.sameValue(val, 0, "value is not mapped to instance");
});
assert(compareArray(sample, arr), "values set during each predicate call");
sample = new TA(arr);
result = sample.find(function(val, i) {
if ( i === 0 ) {
sample[2] = 7;
}
return val === 7;
});
assert.sameValue(result, 7, "value found");
sample = new TA(arr);
result = sample.find(function(val, i) {
if ( i === 0 ) {
sample[2] = 7;
}
return val === 3;
});
assert.sameValue(result, undefined, "value not found");
sample = new TA(arr);
result = sample.find(function(val, i) {
if ( i > 0 ) {
sample[0] = 7;
}
return val === 7;
});
assert.sameValue(result, undefined, "value not found - changed after call");
sample = new TA(arr);
result = sample.find(function() {
sample[0] = 7;
return true;
});
assert.sameValue(result, 1, "find() returns previous found value");
});
|
