13b610be03
All checks were successful
ci / fast (linux) (push) Successful in 6m27s
Implement three missing JS operators that together unblock 57 Test262 full-suite tests (pass rate 42% → 44%): - delete: reference-aware unary operator that removes object properties, with special handling for member/computed/identifier expressions - void: unary operator that evaluates operand and returns undefined - in: binary operator that checks property existence via prototype chain, gated by allow_in flag to disambiguate from for-in loops The allow_in mechanism (with_no_in helper) prevents the parser from consuming `in` as a binary operator inside for-loop initializers, which would break for-in/for-of parsing. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
27 lines
625 B
JavaScript
27 lines
625 B
JavaScript
// delete on object member property
|
|
var o = {x: 1, y: 2};
|
|
var r1 = delete o.x;
|
|
console.log(r1); // true
|
|
console.log(o.x); // undefined
|
|
console.log(o.y); // 2
|
|
|
|
// delete on computed member
|
|
var o2 = {a: 10};
|
|
var r2 = delete o2["a"];
|
|
console.log(r2); // true
|
|
console.log(o2.a); // undefined
|
|
|
|
// delete on declared variable returns false
|
|
var v = 42;
|
|
console.log(delete v); // false
|
|
|
|
// delete on non-reference returns true
|
|
console.log(delete 42); // true
|
|
|
|
// delete on function property
|
|
function f() {}
|
|
f.custom = 99;
|
|
console.log(f.custom); // 99
|
|
delete f.custom;
|
|
console.log(f.custom); // undefined
|