The Tor Browser / file comparison
comparison: js/src/tests/ecma_5/Array/length-truncate-with-indexed.js
js/src/tests/ecma_5/Array/length-truncate-with-indexed.js
- changeset 0
- 6474c204b198
equal
deleted
inserted
replaced
| -1:000000000000 | 0:d58048ec9618 |
|---|---|
| 1 /* | |
| 2 * Any copyright is dedicated to the Public Domain. | |
| 3 * http://creativecommons.org/licenses/publicdomain/ | |
| 4 * Contributor: | |
| 5 * Jeff Walden <jwalden+code@mit.edu> | |
| 6 */ | |
| 7 | |
| 8 //----------------------------------------------------------------------------- | |
| 9 var BUGNUMBER = 858381; | |
| 10 var summary = | |
| 11 "Array length setting/truncating with non-dense, indexed elements"; | |
| 12 | |
| 13 print(BUGNUMBER + ": " + summary); | |
| 14 | |
| 15 /************** | |
| 16 * BEGIN TEST * | |
| 17 **************/ | |
| 18 | |
| 19 function testTruncateDenseAndSparse() | |
| 20 { | |
| 21 var arr; | |
| 22 | |
| 23 // initialized length 16, capacity same | |
| 24 arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]; | |
| 25 | |
| 26 // plus a sparse element | |
| 27 arr[987654321] = 987654321; | |
| 28 | |
| 29 // lop off the sparse element and half the dense elements, shrink capacity | |
| 30 arr.length = 8; | |
| 31 | |
| 32 assertEq(987654321 in arr, false); | |
| 33 assertEq(arr[987654321], undefined); | |
| 34 assertEq(arr.length, 8); | |
| 35 } | |
| 36 testTruncateDenseAndSparse(); | |
| 37 | |
| 38 function testTruncateSparse() | |
| 39 { | |
| 40 // initialized length 8, capacity same | |
| 41 var arr = [0, 1, 2, 3, 4, 5, 6, 7]; | |
| 42 | |
| 43 // plus a sparse element | |
| 44 arr[987654321] = 987654321; | |
| 45 | |
| 46 // lop off the sparse element, leave initialized length/capacity unchanged | |
| 47 arr.length = 8; | |
| 48 | |
| 49 assertEq(987654321 in arr, false); | |
| 50 assertEq(arr[987654321], undefined); | |
| 51 assertEq(arr.length, 8); | |
| 52 } | |
| 53 testTruncateSparse(); | |
| 54 | |
| 55 function testTruncateDenseAndSparseShrinkCapacity() | |
| 56 { | |
| 57 // initialized length 11, capacity...somewhat larger, likely 16 | |
| 58 var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10]; | |
| 59 | |
| 60 // plus a sparse element | |
| 61 arr[987654321] = 987654321; | |
| 62 | |
| 63 // lop off the sparse element, reduce initialized length, reduce capacity | |
| 64 arr.length = 8; | |
| 65 | |
| 66 assertEq(987654321 in arr, false); | |
| 67 assertEq(arr[987654321], undefined); | |
| 68 assertEq(arr.length, 8); | |
| 69 } | |
| 70 testTruncateDenseAndSparseShrinkCapacity(); | |
| 71 | |
| 72 function testTruncateSparseShrinkCapacity() | |
| 73 { | |
| 74 // initialized length 8, capacity same | |
| 75 var arr = [0, 1, 2, 3, 4, 5, 6, 7]; | |
| 76 | |
| 77 // capacity expands to accommodate, initialized length remains same (not equal | |
| 78 // to capacity or length) | |
| 79 arr[15] = 15; | |
| 80 | |
| 81 // now no elements past initialized length | |
| 82 delete arr[15]; | |
| 83 | |
| 84 // ...except a sparse element | |
| 85 arr[987654321] = 987654321; | |
| 86 | |
| 87 // trims sparse element, doesn't change initialized length, shrinks capacity | |
| 88 arr.length = 8; | |
| 89 | |
| 90 assertEq(987654321 in arr, false); | |
| 91 assertEq(arr[987654321], undefined); | |
| 92 assertEq(arr.length, 8); | |
| 93 } | |
| 94 testTruncateSparseShrinkCapacity(); | |
| 95 | |
| 96 /******************************************************************************/ | |
| 97 | |
| 98 if (typeof reportCompare === "function") | |
| 99 reportCompare(true, true); | |
| 100 | |
| 101 print("Tests complete"); |
