Where would noop be used in Ceylon

Question

I am playing around with this beautiful language and saw a function called noop.

As the documentation says it's a void function that does nothing!!

So why would I use a function that does nothing? Is it for adding "Nop" in assembly (for pipeline etc) but then this would be too low-level wouldn't it?

Answer 1

noop() can take the place of any void (or Anything returning) function. So it's useful to use as a value if you are calling a function or creating an object that requires you to pass in an event handler or callback function, but you aren't interested in responding to the event.

Answer 2

noop() is also useful as the default value of an an optional parameter of a function, for example:

void foo(void bar(Integer i) => noop(i)) {}

Or:

void foo(Anything(Integer) bar = noop) {}