Sandwich Devlog 3: Function Junction

Today, I added *functions!* functions are a neat little tool that let you "pipe" math operation outputs into other instructions.
For example, you could assign the output to a variable, like below:

       #Declare a function
       fxa3-3
       #Call the function and assign it to variable
       lv*x
       #will print out 6
       p$v

Or you could print it out directly:

       #Declare a function
       fxs30-3
       #Call it and print it out
       #Will print out 27
       p*x

You can also use variables *inside* a function, like so:

       #Declare a variable
       lv3
       #Declare a function that will use the variable
       fxs30-$v
       #Prints out 27
       p*x

Note that functions will only get evaluated *when they're called*. This means that if you reassign the variable `v` in between the function declaration and the function call, the function will use the *new* value of the variable.
Also, functions are *re-evaluated for each call*. So if they depend on an outside variable and the variable changes frequently, the result of the function will also change frequently.

Nested function calls also work:

       #Declare a function
       fxa2-2
       #Declare a function that calls the other one
       fya*x-4
       #Will print out 8
       p*y

Also note that the only operations you can perform inside a function are the math functions, which are `a`, `s`, `m`, and `d`.

The code is up on [tildegit](https://tildegit.org/karx/sandwich), so clone a copy and get started with sandwich!

tags: sandwich, rust, programming, devlog

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