Source code
Revision control
Copy as Markdown
Other Tools
function sparse() {
var o = {0: 0, 0x10000: 0};
var tests = [[1, false], [0, true], [-2, false], [0x10000, true], [0x20000, false]];
for (var [key, has] of tests) {
assertEq(key in o, has);
assertEq(o.hasOwnProperty(key), has);
}
}
function typedArray() {
var o = {0: 0, 0x10000: 0};
var t = new Int32Array(0x10001)
// Only use Int32Array after we attached the sparse stub
// in o, in t
var tests = [[1, [false, true]],
[0, [true, true]],
[-2, [false, false]],
[0x10000, [true, true]],
[0x20000, [false, false]]];
for (var i = 0; i < 10; i++) {
for (var [key, has] of tests) {
assertEq(key in o, has[i > 5 ? 1 : 0]);
assertEq(o.hasOwnProperty(key), has[i > 5 ? 1 : 0]);
}
if (i == 5)
o = t;
}
}
function protoChange() {
var o = {0: 0, 0x10000: 0};
var tests = [[1, [false, true]],
[0, [true, true]],
[-2, [false, false]],
[0x10000, [true, true]],
[0x20000, [false, false]]];
for (var i = 0; i < 10; i++) {
for (var [key, has] of tests) {
assertEq(key in o, has[i > 5 ? 1 : 0]);
// Proto change doesn't affect hasOwnProperty.
assertEq(o.hasOwnProperty(key), has[0]);
}
if (i == 5)
o.__proto__ = [1, 1, 1, 1];
}
}
sparse();
typedArray();
protoChange();