Code Transformation by Desugaring

• Since last week's class, you added some other binary arithmetic operators to your interpreter. Did you find a way to abstract over them to make your code tidier and more modular?

• Our arithmetic operators are all binary; each one takes exactly two arguments.

  (* 2 3)
  

  If you check the Racket documentation you will see that many of these operators can take an arbitrary number of arguments.

  > (* 2 3)
  6
  > (* 2 3 4)
  24
  > (* 2 3 4 5)
  120
  > (* 2)
  2
  > (*)
  1
  >
  

We could adapt our interpreter to accept such variadic operators in two ways.

1. We could code this up in the basic interpreter.
2. We could transform n-ary calls where \(n>2\) into a sequence of binary calls.

• The first commit of git