// Functions in SuperCollider are within curly brackets  (also called "braces") {}

{ arg a, b, c;  var d;   d = a * b; c + d }

//When evaluated, the function returns the value of its expression.

f = { arg a, b; a + b };
f.value(4, 5).postln;
f.value(10, 200).postln;

f = {44.postln};

f.value // to call the function we need to get its .value

/*
180503 Algorithmic Composition
Variables, functions

*/
Server.default=s=Server.local;
s.boot;
//Global variables
//a-z
a = 10;
b = 20;
c = 0.234521;
a+b+c;

d = "hello";

a = [1, 34, 55, 0.1, "string in a list", \symbol, pi]; // or an array with mixed types

a //hit this line to see the container of a

//local variables
(
var v, a;
v = 22;
a = 33;
)

v // hit this line and watch the post window 
a // hit this line and watch the post window - still our old "a" from above

(
//You cannot evaluate local variables out of their scope of the brackets or a function.
var number9;

number9=9;//sets local vars, NOT global

)
number9;//error: this doesnt work outside of the scope of the brackets 

/*
~ (tilde) global (Environmental variables) 
An Environment is an IdentityDictionary with additional features that allow it to serve as a 'name space' within which functions can be defined and/or evaluated.

The compiler provides a shortcut syntax where ~ is a placeholder for .currentEnvironment. This makes the expression ~myvariable; equivalent to currentEnvironment.at(\myvariable); and the expression ~myvariable = 888; equivalent to currentEnvironment.put(\myvariable, 888);
*/

currentEnvironment; //run this line to the current state of the currentEnvironment

//You use the currentEnvironment via the ~ sign

~myvariable= 888;

//The ~ and = is a shortcut here for 

currentEnvironment.put(\myvariable, 888);

//You can access the variable wherever you need it by 

~myvariable

//environmental variable: sound example
(
~variable1 = {SinOsc.ar(MouseX.kr(400, 800, 1))};
~variable2 = {Saw.ar(MouseY.kr(400, 800, 1))};
~variable3 = (~variable1*~variable2);
)
(
{
	Out.ar(0, ~variable3)
}.play;
)

currentEnvironment; //run this line to the current state of the currentEnvironment

thisProcess.platform.recordingsDir;

{SinOsc.ar(440, 0, 0.3)}.play

{SinOsc.ar(440, 0, 0.4)+SinOsc.ar(660, 0, 0.3)}.play;

(
{LPF.ar(Mix.fill(8, { SinOsc.ar(500 + 500.0.rand, 0, 0.05)}), 2900, 0.5);
}.play
)

SynthDef(\granular, {|out = 0, trig = 1, dur = 0.1, sndbuf, pos = 0.2,
rate = 1, pan = 0, amp = 0.4|
var env, source;
env = EnvGen.kr(Env.adsr, 1, doneAcion: 2);
source = Out.ar(out, GrainBuf.ar(2, Impulse.kr(trig), dur, sndbuf, rate, pos, 2,
pan, envbuf) * env)
}).add;