Inconsistent function behavior?

Question

Can someone explain this for me?

if I call a function within setInterval, it doesn't work.

eg.
1.setInterval(player(), 3000);
//this won't work.

2.setInterval(player, 3000);
//this would rather work

however for other functions like console.log, alert etc, if I call it without the '()' it returns the function definition

Answer 1

SetInerval is used for function only and it accept function name value as first parameter if it is defined anywhere it will run.

But in case alert,console ....
it can be used for string ,numbers,fxn ....
hence it require () to recognise that parameter is a fxn.

Answer 2

thanks 👍