Bits of .NET

Real problem:
Search inputs trigger too many backend calls.

✔ Debounce (use for search)

function debounce(fn, delay){
  let timeout;
  return (...args)=>{
    clearTimeout(timeout);
    timeout = setTimeout(()=>fn(...args), delay);
  };
}

✔ Throttle (use for scroll/resize)

function throttle(fn, delay){
  let last = 0;
  return (...args)=>{
    const now = Date.now();
    if(now - last >= delay){
      last = now;
      fn(...args);
    }
  };
}