Monkey language interpreter

Monkey interpreter with new features in Golang and Typescript based on Thorsten Ball's book Writing an Interpreter in Go.

Base Features

• Integers, booleans, strings, arrays, hash maps
• Arithmetic expressions
• Variables
• Conditionals
• First-class and higher-order functions
• Closures
• Recursion
• Built-in functions
• Macros

Additional features

• for and while loops
• break to stop the current loop within the scope
• Variable scopes for if, for and while blocks
• Assign existing variables without keywords let
• Execute code from files via CLI command
• Line number in error message for parser and evaluator
• Float numbers (INT + FLOAT = FLOAT, INT + INT = INT)
• Allow numbers in identifiers
• Mandatory semicolon for expression statements
• Add items to hashmap via add built-in function
• LTE(<=),GTE(>=) operators
• Fixed bug: "!0" now evaluates correctly to TRUE

Usage

Golang

• run from cli: go run main.go
• run from file: go run main.go -f "file_name"

Typescript

• run from cli: npm run start:repl
• run from file: npx ts-node src/index.ts -f "file_name"