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/*
* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/licenses/publicdomain/
* Contributor:
* Jeff Walden <jwalden+code@mit.edu>
*/
//-----------------------------------------------------------------------------
var BUGNUMBER = 858381;
var summary =
"Array length setting/truncating with non-dense, indexed elements";
print(BUGNUMBER + ": " + summary);
/**************
* BEGIN TEST *
**************/
function testTruncateDenseAndSparse()
{
var arr;
// initialized length 16, capacity same
arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15];
// plus a sparse element
arr[987654321] = 987654321;
// lop off the sparse element and half the dense elements, shrink capacity
arr.length = 8;
assertEq(987654321 in arr, false);
assertEq(arr[987654321], undefined);
assertEq(arr.length, 8);
}
testTruncateDenseAndSparse();
function testTruncateSparse()
{
// initialized length 8, capacity same
var arr = [0, 1, 2, 3, 4, 5, 6, 7];
// plus a sparse element
arr[987654321] = 987654321;
// lop off the sparse element, leave initialized length/capacity unchanged
arr.length = 8;
assertEq(987654321 in arr, false);
assertEq(arr[987654321], undefined);
assertEq(arr.length, 8);
}
testTruncateSparse();
function testTruncateDenseAndSparseShrinkCapacity()
{
// initialized length 11, capacity...somewhat larger, likely 16
var arr = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10];
// plus a sparse element
arr[987654321] = 987654321;
// lop off the sparse element, reduce initialized length, reduce capacity
arr.length = 8;
assertEq(987654321 in arr, false);
assertEq(arr[987654321], undefined);
assertEq(arr.length, 8);
}
testTruncateDenseAndSparseShrinkCapacity();
function testTruncateSparseShrinkCapacity()
{
// initialized length 8, capacity same
var arr = [0, 1, 2, 3, 4, 5, 6, 7];
// capacity expands to accommodate, initialized length remains same (not equal
// to capacity or length)
arr[15] = 15;
// now no elements past initialized length
delete arr[15];
// ...except a sparse element
arr[987654321] = 987654321;
// trims sparse element, doesn't change initialized length, shrinks capacity
arr.length = 8;
assertEq(987654321 in arr, false);
assertEq(arr[987654321], undefined);
assertEq(arr.length, 8);
}
testTruncateSparseShrinkCapacity();
/******************************************************************************/
if (typeof reportCompare === "function")
reportCompare(true, true);
print("Tests complete");
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