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53 lines
1.5 KiB
53 lines
1.5 KiB
/*
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* If the Array.prototype contains numeric elements which are write protected
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* (but configurable), it should be possible to create an array literal with
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* an overriding value. A normal property assignment would fail because the
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* inherited property is not writable. An array initializer is supposed to
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* use [[DefineOwnProperty]] which allows an own property to be created even
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* if there is an inherited property which would normally prevent a write.
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*/
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/*===
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defineProperty success
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0 inherit undefined
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2 foo bar
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0 inherit undefined
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2 shouldsucceed bar
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===*/
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function test() {
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var arr;
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Object.defineProperty(Array.prototype,
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'0',
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{
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value: 'inherit',
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writable: false,
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enumerable: true,
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configurable: true
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});
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print('defineProperty success');
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// No problem here: '0' not accessed
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arr = [];
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print(arr.length, arr[0], arr[1]);
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// Again should succeed
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var arr = ['foo', 'bar'];
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print(arr.length, arr[0], arr[1]);
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// Assignment should not work unless an own property already exists
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arr = [];
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arr[0] = 'shouldfail'; // failure is silent
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print(arr.length, arr[0], arr[1]);
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arr = ['foo', 'bar'];
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arr[0] = 'shouldsucceed';
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print(arr.length, arr[0], arr[1]);
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}
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try {
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test();
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} catch (e) {
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print(e);
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}
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