Monkey

The monkey interpreter from reading the book writing an interpreter in go by Thorsten Ball.

Features

• First class Functions
• Recursion
• Strings
• HashMaps
• Lists (dynamic arrays)
• Integers (int64)
• Floats (float64)
• Modules and import mechanism
• Classes and Objects
• Multiple inheritance
• while loop

TODO

• Keyword arguments
• Default values for arguments
• More informative error messages with positions

Running the code

---

To run the repl with go installed, just run go run main.go and you're good to go

or build an executable by running go build . Then you can use the executable to run monkey applications

monkey filename.monkey

replacing filename with the name of the file

examples

lef factorial = fn (n) {
    if (n < 2){
        return 1;
    }
    return n * factorial(n-1);
}
puts(factorial(2))

Tutorials

Basic Data Type

Data types in Monkey are not declared when writing code. Variables are also dynamic, hence a variable that initially holds a float, may at another point in your program hold a string, or a function, or an object.

Variables are declared as

let VariableName = value;

• An int is just a number without decimal points. These are int64 values

• A float is a number with a decimal point. these are float64 values

• A string is a sequence of characters enclosed in quotations eg. let myString = "Kofi is a boy";