text: let interval = null;
  let result = null;
  
  function initJank() {
  
  	const button = document.getElementById( 'button' );
  	button.addEventListener( 'click', function () {
  
  		if ( interval === null ) {
  
  			interval = setInterval( jank, 1000 / 60 );
  
  			button.textContent = 'STOP JANK';
  
  		} else {
  
  			clearInterval( interval );
  			interval = null;
  
  			button.textContent = 'START JANK';
  			result.textContent = '';
  
  		}
  
  	} );
  
  	result = document.getElementById( 'result' );
  
  }
  
  function jank() {
  
  	let number = 0;
  
  	for ( let i = 0; i < 10000000; i ++ ) {
  
  		number += Math.random();
  
  	}
  
  	result.textContent = number;
  
  }
  
  export default initJank;
  