@monstermann/fn/dist/function/once.js

A utility library for TypeScript.

//#region src/function/once.ts
/**
* `once(fn)`
*
* Creates a function that executes only once and caches the result for subsequent calls.
*
* ```ts
* const expensive = once(() => {
*     console.log("Computing...");
*     return 42;
* });
*
* expensive(); // logs "Computing..." and returns 42
*/
function once(fn) {
	let called = false;
	let ret;
	return () => {
		if (!called) {
			ret = fn();
			called = true;
		}
		return ret;
	};
}

//#endregion
export { once };