ajithranka / jslisp

A simple lisp interpreter in JavaScript.

A simple lisp interpreter in JavaScript.

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Usage

Run using node

$ node build/lisp.js

Type quit to exit

λ quit

Suppported forms

if

λ (if (> pi 5) "true" "false")
"false"

let

λ (let ((x 10) (y 20)) (+ x y))
30

lambda

λ ((lambda (x y) (+ x y)) 10 20)
30

define

λ (define pi 3. 14)
3.14

λ (define square (lambda (x) (* x x)))
square
λ (square 10)
100

set!

λ (define x 10)
10
λ (set! x 20)
20
λ x
20

Credits

I wrote this to understand how an interpreter works. The code borrows heavily from Peter Norvig's Python implementation and Mary Rose Cook's JavaScript version.