Source code
Revision control
Copy as Markdown
Other Tools
// |jit-test| skip-if: !getBuildConfiguration("explicit-resource-management"); --enable-explicit-resource-management
load(libdir + "asserts.js");
{
const arr = [1, 2, 3];
const returned = [];
const iter = arr[Symbol.iterator]();
iter.return = function () {
returned.push('return');
return { done: true };
}
{
using it = iter;
returned.push(it.next().value);
}
assertArrayEq(returned, [1, 'return']);
}
{
const arr = [1, 2, 3];
const returned = [];
const iter = arr[Symbol.iterator]();
iter.return = function () {
returned.push('return');
return { done: true };
}
{
using it = iter;
returned.push(it.next().value);
it.return();
}
assertArrayEq(returned, [1, 'return', 'return']);
}
{
const arr = [1, 2, 3];
const returned = [];
const iter = arr[Symbol.iterator]();
iter.return = function () {
returned.push('return');
return { done: true };
}
{
using it = iter;
returned.push(it.next().value);
}
assertArrayEq(returned, [1, 'return']);
{
using it = iter;
returned.push(it.next().value);
}
assertArrayEq(returned, [1, 'return', 2, 'return']);
}
{
const arr = [1, 2, 3, 4, 5, 6];
const returned = [];
const iter = arr[Symbol.iterator]();
iter.return = function () {
returned.push('return');
return { done: true };
}
{
using it = iter;
returned.push(it.next().value);
returned.push(it.next().value);
}
assertArrayEq(returned, [1, 2, 'return']);
for (let i of iter) {
returned.push(i);
if (i === 4) {
break;
}
}
assertArrayEq(returned, [1, 2, 'return', 3, 4, 'return']);
returned.push(...iter);
assertArrayEq(returned, [1, 2, 'return', 3, 4, 'return', 5, 6]);
}
{
const returned = [];
function getCustomIter() {
const IteratorPrototype = Object.getPrototypeOf(
Object.getPrototypeOf([][Symbol.iterator]())
);
return {
values: [1, 2, 3],
[Symbol.iterator]() {
return this;
},
next() {
return { value: this.values.shift(), done: !this.values.length };
},
return() {
returned.push('return');
return { done: true };
},
__proto__: IteratorPrototype
}
}
{
using it = getCustomIter()[Symbol.iterator]();
returned.push(it.next().value);
returned.push(it.next().value);
}
assertArrayEq(returned, [1, 2, 'return']);
}
{
const returned = [];
function* gen() {
try {
yield 1;
yield 2;
yield 3;
yield 4;
} finally {
returned.push('return');
return;
}
}
{
using iter = gen();
returned.push(iter.next().value);
returned.push(iter.next().value);
}
assertArrayEq(returned, [1, 2, 'return']);
}
{
const arr = [1, 2, 3];
const iter = arr[Symbol.iterator]();
iter.return = undefined;
{
using it = iter;
}
}
{
const arr = [1, 2, 3];
const iter = arr[Symbol.iterator]();
iter.return = null;
{
using it = iter;
}
}
{
const arr = [1, 2, 3];
const iter = arr[Symbol.iterator]();
iter.return = 1;
function testIterNotCallable() {
{
using it = iter;
}
}
assertThrowsInstanceOf(testIterNotCallable, TypeError);
}