js debounce function

debounce.js

var debounce = function(fn, time, immediate) {
  var timeout;
  return function() {
    var that = this;
    var args = arguments;
    
    var later = function() {
      if(!immediate){
        timeout = null;
        func.call(that, args);        
      }
    };

    var callNow = immediate && !timeout;
    clearTimeout(timeout);
    timeout = setTimeout(later, time);
    
    if(callNow) {
      func.call(that, args);
    }
  };
}

window.onresize = debounce(resize, 3000);

function resize(e) {
  console.log('height', window.innerHeight);
  console.log('width', window.innerWidth);
}