Cover image for I Wrote a BrainF*** Interpreter and REPL in TypeScript!

I Wrote a BrainF*** Interpreter and REPL in TypeScript!

awwsmm profile image Andrew (he/him) ・1 min read

Photo by Robina Weermeijer on Unsplash

This was my first time ever coding in TypeScript, my first npm package, and more. Let me know if you have any comments or suggestions!

Try out the sample code on the GitHub repo!

GitHub logo awwsmm / BrainScript

A BrainF*** interpreter written in TypeScript


A BrainF*** (BF) interpreter and REPL, written in TypeScript.


Install from npm with

$ npm i brainscript

Or try it online at npm.runkit.com

var lib = require("brainscript")


BrainScript provides a BF interpreter bf which can be used in interactive or batch mode, as well as a BF REPL brain.

bf can be used to batch process BF code, returning any resulting output as a string

const output: string = bf("++++++++[>++++[>++>+++>+++>+<<<<-]>+>+>->>+[<]<-]>>.>---.+++++++..+++.>>.<-.<.+++.------.--------.>>+.>++.")
console.log(output) // Hello World!\n

...but it also provides basic interactive capabilities for programs which require user input

// input.ts
$ npx ts-node input.ts
    Please provide a single character for ',' input:
    : !


brain is an interactive REPL which accepts single- or…


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Brilliant, a true expression of love for programming. 🌟
I think the first Web Framework for BF should appropriately be called "Mind R*pe".


Capital! Wanna go for the gusto and write the compiler? You got this!


I can't decide on 2 comments:

1 - Brilliant!
2 - what have you brought to this cursed land

Anyway I like it