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35 lines
841 B
35 lines
841 B
12 years ago
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/*
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* Property attributes of array entries. Also tests the properties with
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* and without an internal "array part".
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*/
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function printDesc(desc) {
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print(desc.writable, desc.enumerable, desc.configurable);
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}
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/*===
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true true true
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true true true
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true true true
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true true true
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true true true
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true true true
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true true true
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===*/
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/* array is initially dense (array part exists) */
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a = [1,2,3];
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printDesc(Object.getOwnPropertyDescriptor(a, '0'));
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printDesc(Object.getOwnPropertyDescriptor(a, '1'));
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printDesc(Object.getOwnPropertyDescriptor(a, '2'));
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/* force array to be sparse (array part is abandoned) */
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a[10000] = 4;
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printDesc(Object.getOwnPropertyDescriptor(a, '0'));
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printDesc(Object.getOwnPropertyDescriptor(a, '1'));
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printDesc(Object.getOwnPropertyDescriptor(a, '2'));
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printDesc(Object.getOwnPropertyDescriptor(a, '10000'));
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