Racket

Racket is a functional programming language based on Scheme (which is a dialect of Lisp).

It is very straight forward and very beginner friendly.

Using DrRacket, it is very easy to create simple games or application.

Basics

Open DrRacket and this screen will look similar.

The top window highlighted in red is called the definition window.

This is where variables, functions, and structures will be stored to run the program

The bottom window is called REPL. This stands for Read, Evaluate, Print, Loop.

It takes reads an input which could be a value or an expression, evaluate it, and loops.

Before doing anything, a language needs to be selected on the bottom left.

For beginners purposes, choose Beginning Student.

What this this does is restrict some built in functions to be used.

Therefore limiting the user to focus on the basics.

Everything covered here will be in beginners.

Racket accepts simple and complex expressions.

Do note that more complex expressions must start with open parentheses and must close with ending parentheses.

Number

String

boolean

Characters

Symbols

Function(procedure)

Data Structures

Conditionals, etc.

>(define x 10)
>x
10

or

>(define (add-3 x) (+ x 3))
>(add-3 5)
8

Math

(+ Number Number)
(- Number Number)
(* Number Number)
(/ Number Number)

Sample : Define a variable x and set the value to be 5.

Problem#1 : Define a variable x, and y to value 3 and 7.

Problem#2 : Define a variable xy and set the value to be 3.

Solution to Sample problem.

(define x 5)

There will be more to come!

Keep learning here