Racket

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Racket is a functional language that is a dialect of LISP and a descendant of the Scheme. The logo is taken from the Greek "lamba" character «λ» that is used for the name of an anonymous function in functional programming languages.

Racket is a general-purpose programming language as well as the world’s first ecosystem for language-oriented programming. From the Racket web site at https://racket-lang.org/ .

The following Linux command(s) install Racket.

sudo yum -y install epel-release sudo yum -y --enablerepo=epel-testing install racket

The following Linux command(s) verify the installed version of Racket.

racket -v

On 2019-08-04 the output was as follows.

Welcome to Racket v7.0.

The following Linux command(s) enter interactive mode.

racket

Then type the following commands interactively, pressing Enter after each command. Press Ctrl-D to exit interactive mode.

(4+3)

On the output was as follows.

The file type of a Racket program file is rkt.

The following Linux command(s) create/edit a hello program in the your home directory using the nano text editor.

nano ~/hello.rkt

Create the following program text in the editor that will output the text "Hello world"

#lang racket (printf "Hello world\n")

To exit with save, remember to press Ctrl-X, then "y" (for yes) and Enter to exit.

The following Linux command(s) run the program.

racket ~/hello.rkt

The output should be as follows.

Hello world