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// Test that property keys are only evaluated once.
class PropertyKey {
constructor(key) {
this.key = key;
this.count = 0;
}
toString() {
this.count++;
return this.key;
}
valueOf() {
throw new Error("unexpected valueOf call");
}
}
// AndAssignExpr
{
let obj = {p: true};
let pk = new PropertyKey("p");
obj[pk] &&= false;
assertEq(obj.p, false);
assertEq(pk.count, 1);
obj[pk] &&= true;
assertEq(obj.p, false);
assertEq(pk.count, 2);
}
// OrAssignExpr
{
let obj = {p: false};
let pk = new PropertyKey("p");
obj[pk] ||= true;
assertEq(obj.p, true);
assertEq(pk.count, 1);
obj[pk] ||= false;
assertEq(obj.p, true);
assertEq(pk.count, 2);
}
// CoalesceAssignExpr
{
let obj = {p: null};
let pk = new PropertyKey("p");
obj[pk] ??= true;
assertEq(obj.p, true);
assertEq(pk.count, 1);
obj[pk] ??= false;
assertEq(obj.p, true);
assertEq(pk.count, 2);
}
if (typeof reportCompare === "function")
reportCompare(0, 0);
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