this a simple way of creating element in js

creatingElements.js

//appending elements in js....
function createElements(element, attr, inner) {
  //checkes whether the user has logged in an element
  if(typeof(element) === 'undefined') return false; 
  //checks whether the user has logged in an inner link
  if(typeof(inner) === 'undefined') return inner = 'undefined';
  
  //if ok the element is created
  var el = document.createElement(element); 
  
  //the attr is obj then we get the keys and set them up
  if(typeof(attr) === 'object') {
    for(var key in attr) el.setAttribute(key, attr[key]);
  }
  
  if(!Array.isArray(inner)){
    inner = [inner];
  }
  
  for(var k = 0; k < inner.length; k++) {
    if(inner[k].tagName) {
      el.appendChild(inner[k]);
    } else {
      el.appendChild(document.createTextNode(inner[k])); 
    }
  }
  return el; 
}