Advantage of using apply

[tw00]

Hi,
this little library turned out very helpful for a project I'm working on. One thing though is not 100% clear to me. Is there any reason to use Function.apply over just calling a and b directly?

Currently I'm using this adaption of the function:

function joint( a ) {
  var b = a[(a.length - 1)];
  a.pop();

  a = a.length > 1 ? joint( a ) : a[0];

  return function(...args) {
    return b( a(...args) )
  };
}

It also also allows to pass arguments through the joint functions.

Cheers, Thomas