Source code
Revision control
Copy as Markdown
Other Tools
// Test that Array.prototype.pop doesn't call the [[HasProperty]] internal
// method of objects when retrieving the element at the last index.
var log = [];
var array = [];
var proxy = new Proxy(array, new Proxy({}, {
get(t, trap, r) {
return (t, pk, ...more) => {
log.push(`${trap}:${String(pk)}`);
return Reflect[trap](t, pk, ...more);
};
}
}));
var result;
result = Array.prototype.pop.call(proxy);
assertEqArray(log, [
"get:length",
"set:length", "getOwnPropertyDescriptor:length", "defineProperty:length"
]);
assertEq(result, undefined);
log.length = 0;
array.push(1);
result = Array.prototype.pop.call(proxy);
assertEqArray(log, [
"get:length",
"get:0", "deleteProperty:0",
"set:length", "getOwnPropertyDescriptor:length", "defineProperty:length"
]);
assertEq(result, 1);
log.length = 0;
array.push(2, 3);
result = Array.prototype.pop.call(proxy);
assertEqArray(log, [
"get:length",
"get:1", "deleteProperty:1",
"set:length", "getOwnPropertyDescriptor:length", "defineProperty:length"
]);
assertEq(result, 3);
log.length = 0;
array.push(4, 5);
result = Array.prototype.pop.call(proxy);
assertEqArray(log, [
"get:length",
"get:2", "deleteProperty:2",
"set:length", "getOwnPropertyDescriptor:length", "defineProperty:length"
]);
assertEq(result, 5);
if (typeof reportCompare === "function")
reportCompare(true, true);