typewriter effect using es6 spread

typewriter.js

(function() {
  let textNode, elm,
      textWrapper = document.getElementById('content'),
      text = [...textWrapper.textContent];

  // clear content of the node
  while(textWrapper.hasChildNodes()) {
    textWrapper.removeChild(textWrapper.lastChild);
  }
  
  // apply the effect
  text.map(
    (letter, i) => (
      setTimeout(function(){
        textNode = document.createTextNode(letter);
        elm = document.createElement('span');
        elm.appendChild(textNode);           
        textWrapper.appendChild(elm);
      }, 200*i)
    )
  )
})()