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once

A function that ensures the given callback is executed only once. After the first call, it returns the previously computed result.


Code​

🔗 View source code


Interface​

typescript
function once<T extends (...args: any[]) => any>(callback: T): T

Usage​

Basic Usage​

typescript
import { once } from '@modern-kit/utils';

const initialize = once(() => {
  console.log('Initialization complete');
  return true;
});

initialize(); // Logs 'Initialization complete' and returns true.
initialize(); // Nothing is logged, and the previous result true is returned.

With Arguments​

typescript
import { once } from '@modern-kit/utils';

const onceSum = once((a: number, b: number) => {
  return a + b;
});

onceSum(2, 3); // 5
onceSum(3, 10); // 5, subsequent calls return the previous result even if arguments change.