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var BUGNUMBER = 992617;
var summary = "Implement arguments[@@iterator].";
print(BUGNUMBER + ": " + summary);
// MappedArgumentsObject
let mapped = [
function(a, b, c) {
assertEq(Symbol.iterator in arguments, true);
delete arguments[Symbol.iterator];
assertEq(Symbol.iterator in arguments, false);
},
function(a, b, c) {
delete arguments[Symbol.iterator];
assertEq(Symbol.iterator in arguments, false);
},
function(a, b, c) {
arguments[Symbol.iterator] = 10;
delete arguments[Symbol.iterator];
assertEq(Symbol.iterator in arguments, false);
},
function(a, b, c) {
Object.defineProperty(arguments, Symbol.iterator, {
value: 10, writable: true, enumerable: true, configurable: true
});
delete arguments[Symbol.iterator];
assertEq(Symbol.iterator in arguments, false);
},
function(a, b, c) {
assertEq(arguments[Symbol.iterator], Array.prototype[Symbol.iterator]);
},
function(a, b, c) {
assertEq(arguments[Symbol.iterator].name, "values");
},
function(a, b, c) {
var desc = Object.getOwnPropertyDescriptor(arguments, Symbol.iterator);
assertEq("value" in desc, true);
assertEq(desc.value, Array.prototype[Symbol.iterator]);
assertEq(desc.writable, true);
assertEq(desc.enumerable, false);
assertEq(desc.configurable, true);
},
function(a, b, c) {
var iter = arguments[Symbol.iterator]();
assertDeepEq(iter.next(), { value: 10, done: false });
assertDeepEq(iter.next(), { value: 20, done: false });
assertDeepEq(iter.next(), { value: 30, done: false });
assertDeepEq(iter.next(), { value: undefined, done: true });
},
function(a, b, c) {
assertDeepEq([...arguments], [10, 20, 30]);
},
function(a, b, c) {
b = 40;
assertDeepEq([...arguments], [10, 40, 30]);
},
function(a, b, c) {
arguments.length = 4;
assertDeepEq([...arguments], [10, 20, 30, undefined]);
},
function(a, b, c) {
arguments[5] = 50;
assertDeepEq([...arguments], [10, 20, 30]);
},
function(a, b, c) {
arguments[Symbol.iterator] = function*() {
yield 40;
yield 50;
yield 60;
};
assertDeepEq([...arguments], [40, 50, 60]);
},
];
for (let f of mapped) {
f(10, 20, 30);
}
var g1 = newGlobal();
assertEq(g1.eval(`
function f(a, b, c) {
return arguments[Symbol.iterator].name;
}
f(1, 2, 3);
`), "values");
// UnmappedArgumentsObject
let unmapped = [
function([a], b, c) {
assertEq(Symbol.iterator in arguments, true);
delete arguments[Symbol.iterator];
assertEq(Symbol.iterator in arguments, false);
},
function([a], b, c) {
delete arguments[Symbol.iterator];
assertEq(Symbol.iterator in arguments, false);
},
function([a], b, c) {
arguments[Symbol.iterator] = 10;
delete arguments[Symbol.iterator];
assertEq(Symbol.iterator in arguments, false);
},
function([a], b, c) {
Object.defineProperty(arguments, Symbol.iterator, {
value: 10, writable: true, enumerable: true, configurable: true
});
delete arguments[Symbol.iterator];
assertEq(Symbol.iterator in arguments, false);
},
function([a], b, c) {
assertEq(arguments[Symbol.iterator], Array.prototype[Symbol.iterator]);
},
function([a], b, c) {
assertEq(arguments[Symbol.iterator].name, "values");
},
function([a], b, c) {
var desc = Object.getOwnPropertyDescriptor(arguments, Symbol.iterator);
assertEq("value" in desc, true);
assertEq(desc.value, Array.prototype[Symbol.iterator]);
assertEq(desc.writable, true);
assertEq(desc.enumerable, false);
assertEq(desc.configurable, true);
},
function([a], b, c) {
var iter = arguments[Symbol.iterator]();
assertDeepEq(iter.next(), { value: [10], done: false });
assertDeepEq(iter.next(), { value: 20, done: false });
assertDeepEq(iter.next(), { value: 30, done: false });
assertDeepEq(iter.next(), { value: undefined, done: true });
},
function([a], b, c) {
assertDeepEq([...arguments], [[10], 20, 30]);
},
function([a], b, c) {
b = 40;
assertDeepEq([...arguments], [[10], 20, 30]);
},
function([a], b, c) {
arguments.length = 4;
assertDeepEq([...arguments], [[10], 20, 30, undefined]);
},
function([a], b, c) {
arguments[5] = 50;
assertDeepEq([...arguments], [[10], 20, 30]);
},
function([a], b, c) {
arguments[Symbol.iterator] = function*() {
yield 40;
yield 50;
yield 60;
};
assertDeepEq([...arguments], [40, 50, 60]);
},
];
for (let f of unmapped) {
f([10], 20, 30);
}
var g2 = newGlobal();
assertEq(g2.eval(`
function f([a], b, c) {
return arguments[Symbol.iterator].name;
}
f([1], 2, 3);
`), "values");
if (typeof reportCompare === "function")
reportCompare(true, true);