idexter/monkey

Monkey programming language implementation.

Monkey

Simple implementation Monkey Programming Language while reading Writing An Interpreter In Go.

Build

make

Run

You can run Monkey interpreter with REPL:

./bin/monkeyc -repl

Also, it's possible to run Monkey script from file:

./bin/monkeyc -in ./examples/hello.monkey

Examples

Variables

let age = 1;
let name = "Monkey";
let result = 10 * (20 / 2);

Arrays & Hashes

let myArray = [1, 2, 3, 4, 5];
let thorsten = {"name": "Thorsten", "age": 28};
let myArray2 = ["Thorsten", "Ball", 28, fn(x) { x * x }];

myArray[0] // => 1 
thorsten["name"] // => "Thorsten"

Functions

let add = fn(a, b) { return a + b; };
let add = fn(a, b) { a + b; };

add(1, 2);

let fibonacci = fn(x) { 
    if (x == 0) {
        0
    } else {
        if (x == 1) {
            1
        } else {
            fibonacci(x - 1) + fibonacci(x - 2);
        } 
    }
};

let twice = fn(f, x) { 
    return f(f(x));
};

let addTwo = fn(x) { 
    return x + 2;
};
twice(addTwo, 2); // => 6

Builtin functions

let myArray = ["one", "two", "three"];

len(myArray)            // 3
first(myArray)          // one
rest(myArray)           // [two, three]
last(myArray)           // three
push(myArray, "four")   // [one, two, three, four]

len("Hey Bob, how ya doin?") // 21

puts("Hello World!")