debug/README.md

debug

A lang-extension for debugging, based on sugar/debug from mbutterick/sugar

documentation: http://pkg-build.racket-lang.org/doc/debug/index.html

To debug the value of an expression, simply put debug in front of the language at the top of the file (for instance #lang debug racket), and put #R, #RR or #RRR in front of the expression.

• #R reports the value and returns it
• #RR reports the value with a line number and returns it
• #RRR reports the value with the file and line number, and returns it

#lang debug racket
#R(+ 1 2)

Shows the output:

(+ 1 2) = 3
3

#lang debug racket
(+ 1 2 #R(* 3 4))

Shows the output:

(* 3 4) = 12
15