go-interpreter

Writing an interpreter in go for the monkey programming language. Following along this book from Thorsten bell.

I'll be documenting the process on seagin.me

October 2023: Lexer & Parser complete

Running the REPL

The monkey programming language comes with a REPL. If you wish to run it yourself:

Prerequisites

• Go version 1.6 or above

Installing

1. Clone the repo
2. cd go-interpreter
3. Run go build -o monkey (yes, that's it)
4. Now you can run the monkey repl in your terminal by running: ./monkey

If everything went well you should see this in your terminal:

Welcome to monkey v0.0.0
Press ctrl-d to exit.
>> 5 + 5
10
>> 5 + true;
type mismatch: INTEGER + BOOLEAN
>> 

v0.0.1

The interpreter has been expteded to be able to evaluate function literals and Call expressions. So you interpret inputs like this:

Welcome to monkey v0.0.1
Press ctrl-d to exit.
>> let newAdder = fn(x) { fn(y) { x + y } };
>> let addTwo = newAdder(2)
>> addTwo(3)
5
>> 

v0.0.2

Strings and their evaluation is now supported. Might be buggy as \n, \r, \, & \t are not supported yet. Although operators: +, ==, && != now work on string expressions too.