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
|
// Copyright 2015 Microsoft Corporation. All rights reserved.
// This code is governed by the license found in the LICENSE file.
/*---
esid: sec-array.from
description: Map function without thisArg on non strict mode
info: |
22.1.2.1 Array.from ( items [ , mapfn [ , thisArg ] ] )
...
10. Let len be ToLength(Get(arrayLike, "length")).
11. ReturnIfAbrupt(len).
12. If IsConstructor(C) is true, then
a. Let A be Construct(C, «len»).
13. Else,
b. Let A be ArrayCreate(len).
14. ReturnIfAbrupt(A).
15. Let k be 0.
16. Repeat, while k < len
a. Let Pk be ToString(k).
b. Let kValue be Get(arrayLike, Pk).
c. ReturnIfAbrupt(kValue).
d. If mapping is true, then
i. Let mappedValue be Call(mapfn, T, «kValue, k»).
...
flags: [noStrict]
---*/
var list = {
'0': 41,
'1': 42,
'2': 43,
length: 3
};
var calls = [];
function mapFn(value) {
calls.push({
args: arguments,
thisArg: this
});
return value * 2;
}
var result = Array.from(list, mapFn);
assert.sameValue(result.length, 3, 'The value of result.length is expected to be 3');
assert.sameValue(result[0], 82, 'The value of result[0] is expected to be 82');
assert.sameValue(result[1], 84, 'The value of result[1] is expected to be 84');
assert.sameValue(result[2], 86, 'The value of result[2] is expected to be 86');
assert.sameValue(calls.length, 3, 'The value of calls.length is expected to be 3');
assert.sameValue(calls[0].args.length, 2, 'The value of calls[0].args.length is expected to be 2');
assert.sameValue(calls[0].args[0], 41, 'The value of calls[0].args[0] is expected to be 41');
assert.sameValue(calls[0].args[1], 0, 'The value of calls[0].args[1] is expected to be 0');
assert.sameValue(calls[0].thisArg, this, 'The value of calls[0].thisArg is expected to be this');
assert.sameValue(calls[1].args.length, 2, 'The value of calls[1].args.length is expected to be 2');
assert.sameValue(calls[1].args[0], 42, 'The value of calls[1].args[0] is expected to be 42');
assert.sameValue(calls[1].args[1], 1, 'The value of calls[1].args[1] is expected to be 1');
assert.sameValue(calls[1].thisArg, this, 'The value of calls[1].thisArg is expected to be this');
assert.sameValue(calls[2].args.length, 2, 'The value of calls[2].args.length is expected to be 2');
assert.sameValue(calls[2].args[0], 43, 'The value of calls[2].args[0] is expected to be 43');
assert.sameValue(calls[2].args[1], 2, 'The value of calls[2].args[1] is expected to be 2');
assert.sameValue(calls[2].thisArg, this, 'The value of calls[2].thisArg is expected to be this');
reportCompare(0, 0);
|
