blob: 252a877cae1fcc43363565dfbd585e05e90970f3 (
plain)
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
|
// Copyright (C) 2015 the V8 project authors. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
es6id: 21.1.3.18
description: >
Returns true if searchString appears as a substring of the given string.
info: |
21.1.3.18 String.prototype.startsWith ( searchString [ , position ] )
...
11. Let len be the number of elements in S.
12. Let start be min(max(pos, 0), len).
13. Let searchLength be the number of elements in searchStr.
14. If searchLength+start is greater than len, return false.
15. If the sequence of elements of S starting at start of length searchLength
is the same as the full element sequence of searchStr, return true.
...
---*/
var str = 'The future is cool!';
assert(str.startsWith('The '), 'str.startsWith("The ") === true');
assert(str.startsWith('The future'), 'str.startsWith("The future") === true');
assert(str.startsWith(str), 'str.startsWith(str) === true');
reportCompare(0, 0);
|
