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test_binding_loop_closures.js
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test_binding_loop_closures.js
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const failures = [];
function assertArrayEq(name, got, expected) {
const ok = got.length === expected.length &&
got.every((v, i) => v === expected[i]);
if (!ok) {
failures.push(`${name}: expected [${expected.join(', ')}], got [${got.join(', ')}]`);
}
}
function collectForInLet() {
const funcs = [];
for (let key in { a: 1, b: 1, c: 1 }) {
funcs.push(() => key);
}
return funcs.map(fn => fn());
}
function collectForInConst() {
const funcs = [];
for (const key in { a: 1, b: 1, c: 1 }) {
funcs.push(() => key);
}
return funcs.map(fn => fn());
}
function collectForOfLet() {
const funcs = [];
for (let value of ['x', 'y', 'z']) {
funcs.push(() => value);
}
return funcs.map(fn => fn());
}
function collectForOfConst() {
const funcs = [];
for (const value of ['x', 'y', 'z']) {
funcs.push(() => value);
}
return funcs.map(fn => fn());
}
function collectForOfDestructureLet() {
const funcs = [];
for (let [k, v] of [['a', 1], ['b', 2], ['c', 3]]) {
funcs.push(() => `${k}:${v}`);
}
return funcs.map(fn => fn());
}
assertArrayEq('for-in let closure', collectForInLet(), ['a', 'b', 'c']);
assertArrayEq('for-in const closure', collectForInConst(), ['a', 'b', 'c']);
assertArrayEq('for-of let closure', collectForOfLet(), ['x', 'y', 'z']);
assertArrayEq('for-of const closure', collectForOfConst(), ['x', 'y', 'z']);
assertArrayEq(
'for-of let destructuring closure',
collectForOfDestructureLet(),
['a:1', 'b:2', 'c:3']
);
if (failures.length > 0) {
console.log('Binding loop closure failures:');
for (let i = 0; i < failures.length; i++) {
console.log(` ${i + 1}. ${failures[i]}`);
}
throw new Error(`Found ${failures.length} binding-loop closure regression(s)`);
}
console.log('PASS: binding loop closures');

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