Q.

Make a program that filters a list of strings and returns a list with only your friends name in it.

If a name has exactly 4 letters in it, you can be sure that it has to be a friend of yours! Otherwise, you can be sure he's not...

Ex: Input = ["Ryan", "Kieran", "Jason", "Yous"], Output = ["Ryan", "Yous"]

i.e.

friend ["Ryan", "Kieran", "Mark"] shouldBe ["Ryan", "Mark"]
Note: keep the original order of the names in the output.

A)

function friend(friends){
  //your code here
  let res = [];
  friends.forEach( el => {
    el.length === 4 ? res.push(el) : null
  })
  return res
}