1 // Copyright 2014 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
6 function TestStringPrototypeIterator() {
7 assertTrue(String.prototype.hasOwnProperty(Symbol.iterator));
8 assertFalse("".hasOwnProperty(Symbol.iterator));
9 assertFalse("".propertyIsEnumerable(Symbol.iterator));
11 TestStringPrototypeIterator();
14 function assertIteratorResult(value, done, result) {
15 assertEquals({value: value, done: done}, result);
19 function TestManualIteration() {
21 var iterator = string[Symbol.iterator]();
22 assertIteratorResult('a', false, iterator.next());
23 assertIteratorResult('b', false, iterator.next());
24 assertIteratorResult('c', false, iterator.next());
25 assertIteratorResult(void 0, true, iterator.next());
26 assertIteratorResult(void 0, true, iterator.next());
28 TestManualIteration();
31 function TestSurrogatePairs() {
35 var string = "abc" + pair + "def" + lo + pair + hi + lo;
36 var iterator = string[Symbol.iterator]();
37 assertIteratorResult('a', false, iterator.next());
38 assertIteratorResult('b', false, iterator.next());
39 assertIteratorResult('c', false, iterator.next());
40 assertIteratorResult(pair, false, iterator.next());
41 assertIteratorResult('d', false, iterator.next());
42 assertIteratorResult('e', false, iterator.next());
43 assertIteratorResult('f', false, iterator.next());
44 assertIteratorResult(lo, false, iterator.next());
45 assertIteratorResult(pair, false, iterator.next());
46 assertIteratorResult(hi, false, iterator.next());
47 assertIteratorResult(lo, false, iterator.next());
48 assertIteratorResult(void 0, true, iterator.next());
49 assertIteratorResult(void 0, true, iterator.next());
54 function TestStringIteratorPrototype() {
55 var iterator = ""[Symbol.iterator]();
56 var StringIteratorPrototype = iterator.__proto__;
57 assertFalse(StringIteratorPrototype.hasOwnProperty('constructor'));
58 assertEquals(StringIteratorPrototype.__proto__, Object.prototype);
59 assertArrayEquals(['next'],
60 Object.getOwnPropertyNames(StringIteratorPrototype));
61 assertEquals('[object String Iterator]', "" + iterator);
63 TestStringIteratorPrototype();
66 function TestForOf() {
70 var string = "abc" + pair + "def" + lo + pair + hi + lo;
71 var expected = ['a', 'b', 'c', pair, 'd', 'e', 'f', lo, pair, hi, lo];
74 for (var char of string) {
75 assertEquals(expected[i++], char);
78 assertEquals(expected.length, i);
83 function TestNonOwnSlots() {
84 var iterator = ""[Symbol.iterator]();
85 var object = {__proto__: iterator};
87 assertThrows(function() { object.next(); }, TypeError);