2666. Allow One Function Call

https://leetcode.com/problems/allow-one-function-call

Javascript

var once = function(fn) {
    let isCalled = false
    return function(...args){
        if (!isCalled) {
            isCalled = true
            return fn(...args)
        }
    }
};

Typescript

function once<T extends (...args: any[]) => any>(fn: T):
 ((...args: Parameters<T>) => ReturnType<T> | undefined) {
  let isCalled = false
  return function (...args) {
    if (!isCalled) {
        isCalled = true
        return fn(...args)
    }
  };
}