Source code
Revision control
Copy as Markdown
Other Tools
function testFreeze() {
var arr = [];
for (var i = 0; i < 20; i++)
arr.push(i);
for (var i = 0; i < 10; i++)
arr.shift();
Object.freeze(arr);
assertEq(arr.length, 10);
arr[0] = -1;
assertEq(arr[0], 10);
}
testFreeze();
testFreeze();
function testCopyOnWrite() {
var arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];
for (var i = 0; i < 5; i++)
assertEq(arr.shift(), i + 1);
assertEq(arr.toString(), "6,7,8,9");
}
testCopyOnWrite();
testCopyOnWrite();
function testNonWritableLength() {
var arr = [];
for (var i = 0; i < 20; i++)
arr.push(i);
Object.defineProperty(arr, "length", {writable: false, value: arr.length});
var ex;
try {
arr.shift();
} catch(e) {
ex = e;
}
assertEq(ex instanceof TypeError, true);
assertEq(arr.length, 20);
}
testNonWritableLength();
testNonWritableLength();