lispi

An in-browser Lisp interpreter (for a subset of Scheme)

Demo

http://polar-shore-4611.herokuapp.com

Usage

bundle install
rackup

Controls

Up and down for history

Enter to interpret

Examples (more coming soon)

Arithmetic

(+ 2 3) => 5

(+ 2 (* 5 6)) => 32

(+ (+ 2 (+ 1 2)) (* (+ 1 2) (+ 1 2))) => (+ 5 9) => 14

Variables

(set! somevar 5) => true (success)

(defined somevar) => somevar is 5 => true

Anonymous and named functions

(4 (lambda n (+ n 3))) => 7

(define myfunc (lambda n (* n 4))) => true

(myfunc 5) => 20

Conditionals

(if (= 1 2) (3) (4)) => 4

(/ 20 (if (= (* 7 7) (49)) (2) (5))) => 10