A function that wraps another function and prevents it from repeatedly firing.

Debounce.js

function debounce(func, immediate, wait) {
  
 let timeout;
  
  return function() {
    let context = this,
        args = arguments;
    let callNow = immediate && !timeout;
    clearTimeout(timeout);
    
    timeout = setTimeout(function(){
      timeout = null;
      if(!immediate) {
        func.apply(context, args);
      }
    }, wait || 400);
    
    if(callNow) {
      func.apply(context, args);
    }
    
  }
}