DOM / pure JavaScript solution to jQuery.closest() implementation?

Answer 1

  

    
Hello World
  


function closest(el, classname) {
   if(el.parentNode){
        if(el.parentNode.className.includes(classname)){
        return el.parentNode;
      }
      else{
        return closest(el.parentNode, classname);
      }
   }
   else{
    return false;
   }
}

var world = document.getElementById('world');
var closest = closest(world, 'item');
console.log(closest);