Javascript shorthand for calling a callback function if it is not null?

Question

If we have:

(cb)=>{ if (cb!=null) cb()}

Is there are shorter way to check if cb is not null and call it? This will be running on Node.

Answer 1

Now in 2021 : Optional chaining

cb?.()

If cb is null - cb is not invoked.

if cb is a func, cb is invoked.

Note: if cb is a not function or not a non null/undefined value, (eg 23 or false) then this will throw a TypeError.