Monkey Interpreter

This repository contains my implementation of the Monkey programming language interpreter, developed while following the book Writing An Interpreter In Go by Thorsten Ball.

Overview

Monkey is a simple yet powerful interpreted programming language. This interpreter includes support for:

• Primitive data types: integers, booleans, strings
• Arithmetic and boolean expressions
• Variable bindings and environments
• First-class functions with closures
• Built-in functions (e.g., len, first, last)
• Conditionals and loops
• Metaprogramming and macros
• A basic REPL for interactive use

Getting Started

Prerequisites

To build and run the interpreter, you need:

• Go (1.18 or later recommended)

Installation

Clone the repository:

git clone https://github.com/yourusername/monkey-interpreter.git
cd monkey-interpreter

Build the interpreter:

go build -o monkey

Run the REPL:

./monkey

Usage

In the REPL, you can enter Monkey code interactively:

>> let add = fn(a, b) { a + b; };
>> add(2, 3);
5

You can also run Monkey scripts from a file:

./monkey script.monkey

Project Structure

monkey/
├── ast/         # Abstract Syntax Tree definitions
├── evaluator/   # Expression and statement evaluation
├── lexer/       # Lexer implementation
├── object/      # Object system for runtime values
├── parser/      # Parsing logic
├── repl/        # Read-Eval-Print Loop (REPL)
├── token/       # Token definitions
└── main.go      # Entry point

Acknowledgments

This project is based on Writing An Interpreter In Go by Thorsten Ball. Highly recommended for anyone interested in language implementation!

License

This project is licensed under the MIT License.

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Happy coding! 🚀