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49 lines
1.2 KiB
49 lines
1.2 KiB
/*===
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{"quux":3,"foo":1}
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0 quux
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1 foo
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2 baz
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{"quux":3,"foo":1,"baz":4}
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===*/
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/* Should ancestor properties be enumerated when creating PropertyList?
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* Specification is a bit unclear on this point. See E5.1 Section 15.12.3,
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* main algorithm, step 4.b.ii.
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*
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* We currently iterate ancestor array indexed properties too.
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*
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* Creating an array instance with a chosen internal prototype is apparently
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* not possible. However, Array.prototype is itself an array and we can add
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* a value to it.
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*/
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function propertyListAncestorTest() {
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var obj = { foo: 1, bar: 2, quux: 3, baz: 4 };
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var k;
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var plist;
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// baseline
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print(JSON.stringify(obj, [ 'quux', 'foo' ]));
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// this is not very common
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Array.prototype[2] = 'baz';
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// plist will contain "0" and "1", and will inherit "2"
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plist = [ 'quux', 'foo' ];
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for (var k in plist) {
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print(k, plist[k]);
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}
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// Now E5.1 Section 15.12.3, main algorithm, step 4.b.ii should presumably
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// iterate indices "0" and "1" from the array and "2" from the ancestor.
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// Note that 'length' plays no role in this.
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//
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// (Both Rhino and V8 fail this test.)
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print(JSON.stringify(obj, plist));
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}
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try {
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propertyListAncestorTest();
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} catch (e) {
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print(e.name);
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}
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