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
|
// Copyright (C) 2017 Valerie Young. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.
/*---
esid: sec-string.prototype.trimEnd
description: >
This value is an object which cannot be converted to a primitive
info: |
Runtime Semantics: TrimString ( string, where )
1. Let str be ? RequireObjectCoercible(string).
2. Let S be ? ToString(str).
...
ToString ( argument )
If argument is Object:
1. Let primValue be ? ToPrimitive(argument, hint String).
...
ToPrimitive ( input [, PreferredType ])
...
b. Else if PreferredType is hint String, let hint be "string".
...
d. Let exoticToPrim be ? GetMethod(input, @@toPrimitive)
e. If exoticToPrim is not undefined, then
i. Let result be ? Call(exoticToPrim, input, « hint »).
ii. If Type(result) is not Object, return result.
iii. Throw a TypeError exception.
f. If hint is "default", set hint to "number".
g. Return ? OrdinaryToPrimitive(input, hint).
...
OrdinaryToPrimitive( O, hint )
...
3. If hint is "string", then
a. Let methodNames be « "toString", "valueOf" ».
...
5. For each name in methodNames in List order, do
a. Let method be ? Get(O, name).
b. If IsCallable(method) is true, then
i. Let result be ? Call(method, O).
ii. If Type(result) is not Object, return result.
6. Throw a TypeError exception.
features: [string-trimming, String.prototype.trimEnd, Symbol.toPrimitive]
---*/
var thisVal = {
[Symbol.toPrimitive]: undefined,
toString: undefined,
valueOf: undefined,
};
// If trimEnd is called on an object with neither Symbol.toPrimitive, toString
// nor valueOf defined, then a TypeError exception should be thrown.
assert.throws(
TypeError,
function() { String.prototype.trimEnd.call(thisVal); },
);
|
