JavaScript Evolution ECMAScript 6 - Function with Default Parameter

In ES2015, a developer can add a default parameter into a function. Example:

function loadProfile(usernames=[]){
  if (usernames.lenght > 3){
    let loadingMessage ="This will take a while.";
  }
}

With default parameter, you can call the function either

loadProfile(['Simon','Alex','Arlene']);

Or

loadProfile();

Scala has more powerful default parameter. Let's create Scala function with default parameter.

def addInt(a:Int=5, b:Int=7) = {
  var sum: Int = a + b;
  return sum
}

You can call the function by passing the parameter using a pointer.

addInt(b=10)

Passing parameter using pointer is not implement in JavaScript.