what is the difference between using findViewById() and using directly the id?

Question

I'm new with android and kotlin, so sorry if it's a too basic question but I don't see the difference between this

        findViewById<Button>(R.id.done_button).setOnClickListener { changeNickname() }

and thisdone_button.setOnClickListener { changeNickname() }

Answer 1

if you will use done_button more one time it will be to much writing each time add this

findViewById<Button>(R.id.done_button)

in general your code have to be smallest and readable please read more about the clean code .