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48 lines
974 B
48 lines
974 B
12 years ago
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/*
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* The order of checks and coercions for a property access are defined
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* by the property accessor evaluation rules in E5 Section 11.2.1,
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* GetValue() in E5 Section 8.7.1, and finally [[Get]].
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*
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* In short:
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*
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* - CheckObjectCoercible for base reference. TypeError for null and
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* undefined. (E5 Section 11.2.1 step 5)
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*
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* - ToString for property name. This may have side effects and thus
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* order matters. (E5 Section 11.2.1 step 6).
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*
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* - ToObject for base reference. (E5 Section 8.7.1, special [[Get]],
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* step 1)
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*
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*/
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var t = {}
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t.toString = function() { print("toString() called"); return "foo"; };
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/*===
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TypeError
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===*/
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// CheckObjectCoercible fails, toString() doesn't get called
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try {
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null[t] = 'bar';
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} catch (e) {
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print(e.name);
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}
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/*===
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toString() called
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bar
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===*/
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// CheckObjectCoercible succeeds, toString() gets called
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try {
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var o = {};
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o[t] = 'bar';
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print(o.foo);
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} catch (e) {
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print(e.name);
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}
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