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
|
// Copyright 2014 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
// Note: concat does not currently support species so there is no difference
// between [].concat(foo) and Array.prototype.concat.apply(foo).
var log = [];
var logger = {};
var handler = new Proxy({}, logger);
logger.get = function(t, trap, r) {
return function(...args) {
log.push([trap, ...args]);
return Reflect[trap](...args);
}
};
var target = {0: "a", 1: "b", [Symbol.isConcatSpreadable]: "truish"};
var obj = new Proxy(target, handler);
log.length = 0;
assertEquals([], [].concat(obj));
assertEquals(2, log.length);
for (var i in log) assertSame(target, log[i][1]);
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
assertEquals(["get", target, "length", obj], log[1]);
log.length = 0;
assertEquals([], Array.prototype.concat.apply(obj));
assertEquals(2, log.length);
for (var i in log) assertSame(target, log[i][1]);
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
assertEquals(["get", target, "length", obj], log[1]);
target.length = 3;
log.length = 0;
assertEquals(["a", "b", undefined], [].concat(obj));
assertEquals(7, log.length);
for (var i in log) assertSame(target, log[i][1]);
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
assertEquals(["get", target, "length", obj], log[1]);
assertEquals(["has", target, "0"], log[2]);
assertEquals(["get", target, "0", obj], log[3]);
assertEquals(["has", target, "1"], log[4]);
assertEquals(["get", target, "1", obj], log[5]);
assertEquals(["has", target, "2"], log[6]);
log.length = 0;
assertEquals(["a", "b", undefined], Array.prototype.concat.apply(obj));
assertEquals(7, log.length);
for (var i in log) assertSame(target, log[i][1]);
assertEquals(["get", target, Symbol.isConcatSpreadable, obj], log[0]);
assertEquals(["get", target, "length", obj], log[1]);
assertEquals(["has", target, "0"], log[2]);
assertEquals(["get", target, "0", obj], log[3]);
assertEquals(["has", target, "1"], log[4]);
assertEquals(["get", target, "1", obj], log[5]);
assertEquals(["has", target, "2"], log[6]);
|
