GitHub 6219★

Execute a function once

JavaScript version

const once = (fn) =>
(
(ran = false) =>
() =>
ran ? fn : ((ran = !ran), (fn = fn()))
)();

Examples

let n = 0;
const incOnce = once(() => ++n);
incOnce(); // n = 1
incOnce(); // n = 1
incOnce(); // n = 1
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