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closures.js
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closures.js
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function test1() {
function inner() {
return 42;
}
return inner();
}
for (let i = 0; i < 110; i++) test1();
console.log('[test1] simple inner fn:', test1(), 'ok:', test1() === 42);
function test2(x) {
function inner() {
return x;
}
return inner();
}
for (let i = 0; i < 110; i++) test2(i);
console.log('[test2] capture param:', test2(99), 'ok:', test2(99) === 99);
function test3() {
let val = 100;
function inner() {
return val;
}
return inner();
}
for (let i = 0; i < 110; i++) test3();
console.log('[test3] capture local:', test3(), 'ok:', test3() === 100);
function test4() {
let count = 0;
function inc() {
count = count + 1;
}
inc();
inc();
inc();
return count;
}
for (let i = 0; i < 110; i++) test4();
console.log('[test4] mutate upval:', test4(), 'ok:', test4() === 3);
function test5() {
let n = 0;
function next() {
n = n + 1;
return n;
}
next();
next();
return next();
}
for (let i = 0; i < 110; i++) test5();
console.log('[test5] counter:', test5(), 'ok:', test5() === 3);
function test6() {
let x = 10;
return function () {
return x;
};
}
let fn6 = test6();
console.log('[test6] returned closure:', fn6(), 'ok:', fn6() === 10);
function test7() {
let fns = [];
for (let i = 0; i < 5; i++) {
fns.push(function () {
return i;
});
}
return fns[0]() + fns[1]() + fns[2]() + fns[3]() + fns[4]();
}
console.log('[test7] loop closures:', test7(), 'ok:', test7() === 10);
function test8(n) {
let sum = 0;
function addTo(x) {
sum = sum + x;
}
for (let i = 0; i < n; i++) addTo(i);
return sum;
}
for (let i = 0; i < 110; i++) test8(10);
let r8 = test8(1000);
let e8 = (999 * 1000) / 2;
console.log('[test8] hot closure call:', r8, 'ok:', r8 === e8);

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closures.js (1 KB)

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