File: symbol-hasinstance-invocation.js

package info (click to toggle)
qtdeclarative-opensource-src-gles 5.15.17%2Bdfsg-1
  • links: PTS, VCS
  • area: main
  • in suites: experimental
  • size: 258,992 kB
  • sloc: javascript: 512,415; cpp: 497,385; xml: 8,892; python: 3,304; ansic: 2,764; sh: 206; makefile: 46; php: 27
file content (32 lines) | stat: -rw-r--r-- 861 bytes parent folder | download | duplicates (11)
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
// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
es6id: 12.9.4
description: >
    Arguments and 'this' value when invoking constructor's @@hasInstance property
info: |
    1. If Type(C) is not Object, throw a TypeError exception.
    2. Let instOfHandler be GetMethod(C,@@hasInstance).
    3. ReturnIfAbrupt(instOfHandler).
    4. If instOfHandler is not undefined, then
       a. Return ToBoolean(Call(instOfHandler, C, «O»)).
features: [Symbol.hasInstance]
---*/

var F = {};
var callCount = 0;
var thisValue, args;

F[Symbol.hasInstance] = function() {
  thisValue = this;
  args = arguments;
  callCount += 1;
};

0 instanceof F;

assert.sameValue(callCount, 1);
assert.sameValue(thisValue, F);
assert.sameValue(args.length, 1);
assert.sameValue(args[0], 0);