text: //arrow function in js
  
  var magic = function () {
  	return new Date()
  }
  
  document.write(magic() + "<br>")
  
  // now we change it to arrow function
  
  var magic2 =  () => new Date()
  
  document.write(magic2() + "<br>")
  
  
  // normal function with parameters function 
  
  var concatOne = function(arrOne, arrTwo){
  	return arrOne.concat(arrTwo)
  }
  
  document.write([1,2,3], [,4,5,6] + "<br>")
  
  // now we change it to arrow function 
  
  var concatTwo = (arOne, arTwo) => arOne.concat(arTwo)
  
  document.write([10,11,12], [,13,14,15] + "<br>")
  
  document.write(concatTwo([10,11,12], [13,14,15] + "<br>")) 
  
  // as you can see both method is work, but with second method we do not need to do any modification
  
  
  
  