Partial Application and argument * and ... in SuperCollider

Partial_Application

//:n Normal way to define a function
f = { | i | i.squared }


f ! 5
[ 0, 1, 4, 9, 16 ]

//:p Partial application

g = _.squared;
a Function

g ! 5
[ 0, 1, 4, 9, 16 ]


//:d Doc
// "_.squared" is the same as: { | i | i.squared }

//See help file Partial-Application.html for full doc. 

// More examples: 

//:2 arguments 

g = Point(_, _);

g.value(100, 200);

//:4 arguments

h = Rect(_, _, _, _);

h.value(100, 200, 500, 240).postln;

// But!
i = Rect(*_);

(Array.rand(12, 0, 1000).clump(4) collect: i).postln;

//:* What about the star

f = { | arg1, arg2, arg3 | postf("arg1 is: %, arg2 is: %, arg3 is: %\n", arg1, arg2, arg3) }; 

f.(100).postln;
f.(100, 200, 300).postln;
f.([100, 200, 300]).postln;
f.(*[100, 200, 300]).postln;

g = f.(*_);

Array.rand(12, 0, 1000).clump(3) do: g;

//:. The opposite of * is ...

f = { | ... coords | Rect(*coords).postln };