mirror of
https://github.com/LadybirdBrowser/ladybird.git
synced 2025-04-25 22:08:59 +00:00
f897c41092
It turns out "delete" is actually a unary op :) This patch implements deletion of object properties, it doesn't yet work for casually deleting properties from the global object. When deleting a property from an object, we switch that object to having a unique shape, no longer sharing shapes with others. Once an object has a unique shape, it no longer needs to care about shape transitions.
60 lines
1.8 KiB
JavaScript
60 lines
1.8 KiB
JavaScript
load("test-common.js");
|
|
|
|
try {
|
|
o = {};
|
|
o.x = 1;
|
|
o.y = 2;
|
|
o.z = 3;
|
|
assert(Object.getOwnPropertyNames(o).length === 3);
|
|
|
|
assert(delete o.x === true);
|
|
assert(o.hasOwnProperty('x') === false);
|
|
assert(o.hasOwnProperty('y') === true);
|
|
assert(o.hasOwnProperty('z') === true);
|
|
assert(Object.getOwnPropertyNames(o).length === 2);
|
|
|
|
assert(delete o.y === true);
|
|
assert(o.hasOwnProperty('x') === false);
|
|
assert(o.hasOwnProperty('y') === false);
|
|
assert(o.hasOwnProperty('z') === true);
|
|
assert(Object.getOwnPropertyNames(o).length === 1);
|
|
|
|
assert(delete o.z === true);
|
|
assert(o.hasOwnProperty('x') === false);
|
|
assert(o.hasOwnProperty('y') === false);
|
|
assert(o.hasOwnProperty('z') === false);
|
|
assert(Object.getOwnPropertyNames(o).length === 0);
|
|
|
|
a = [ 3, 5, 7 ];
|
|
|
|
assert(Object.getOwnPropertyNames(a).length === 4);
|
|
|
|
assert(delete a[0] === true);
|
|
assert(a.hasOwnProperty(0) === false);
|
|
assert(a.hasOwnProperty(1) === true);
|
|
assert(a.hasOwnProperty(2) === true);
|
|
assert(Object.getOwnPropertyNames(a).length === 3);
|
|
|
|
assert(delete a[1] === true);
|
|
assert(a.hasOwnProperty(0) === false);
|
|
assert(a.hasOwnProperty(1) === false);
|
|
assert(a.hasOwnProperty(2) === true);
|
|
assert(Object.getOwnPropertyNames(a).length === 2);
|
|
|
|
assert(delete a[2] === true);
|
|
assert(a.hasOwnProperty(0) === false);
|
|
assert(a.hasOwnProperty(1) === false);
|
|
assert(a.hasOwnProperty(2) === false);
|
|
assert(Object.getOwnPropertyNames(a).length === 1);
|
|
|
|
q = {};
|
|
Object.defineProperty(q, "foo", { value: 1, writable: false, enumerable: false });
|
|
assert(q.foo === 1);
|
|
|
|
assert(delete q.foo === false);
|
|
assert(q.hasOwnProperty('foo') === true);
|
|
|
|
console.log("PASS");
|
|
} catch (e) {
|
|
console.log("FAIL: " + e);
|
|
}
|