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77 lines
959 B
77 lines
959 B
/*
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* Array enumeration order is not strictly specified. This test case
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* compares behavior against the currently desired semantics:
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*
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* - If dense, enumerate array keys first, then other keys
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*
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* - When converting to sparse, re-add keys so that array keys
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* are first (i.e. preserve order when abandoning array part)
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*
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* - If sparse, maintain key insertion order only
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*/
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/*---
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{
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"custom": true
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}
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---*/
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function enumArray(arr) {
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print('array keys');
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for (var i in arr) {
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print(i);
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}
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}
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/*===
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array keys
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0
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1
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2
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foo
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array keys
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0
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1
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2
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3
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4
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foo
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array keys
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0
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1
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2
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3
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4
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foo
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10000
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array keys
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0
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1
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2
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3
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4
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foo
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10000
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10
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===*/
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var a;
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// initially dense
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a = [1,2,3];
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a.foo = 'bar';
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enumArray(a);
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// new keys, array order maintained (NOT insertion order)
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a[4] = 5;
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a[3] = 4;
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enumArray(a);
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// force to sparse
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a[10000] = 9999;
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enumArray(a);
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// array order no longer maintained; now insertion order
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a[10] = 9;
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enumArray(a);
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