JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://raw.github.com/madrobby/keymaster/master/keymaster.min.js"></script>

<p>
hi
</p>

JavaScript

$(function () {
   var combination = ''
   key('left', function(){ 
       combination = 'left';
       alert(combination);
       checkCombination();
   });
   key('right', function(){ 
       combination+= 'right';
       checkCombination();
   });
   key('up', function(){ 
       combination+= 'up';
       checkCombination();
   });
   key('down', function(){ 
       combination+= 'down';
       checkCombination();
   });

   function checkCombination() {
      if(combination === 'leftrightupdown') {
        alert('surprise 1');  
      } 
   }
});