Meow Programming Language

The purrfect functional programming language

Meow Programming Language is a cat-themed functional programming language that transpiles .nyan files to Go and compiles to native binaries.

Get Started Download
hello.nyan
kitty Cat {
  name: string
  age: int
}

nyan nyantyu = Cat("Nyantyu", 3)

meow greet(cat Cat) string {
  bring cat.name + " says hello!"
}

nya(greet(nyantyu))
$ meow run hello.nyan
Nyantyu says hello!

What is Meow Programming Language?

Meow Programming Language is a cat-themed functional programming language that transpiles to Go. It uses playful keywords such as nyan, meow, purr, and hiss, while still compiling to native binaries through Go — so your .nyan programs run at the same speed as hand-written Go code.

Why Meow Programming Language?

🐱

Cat-Themed Syntax

Every keyword is a cat word — nyan, meow, sniff, purr, hiss. Programming has never been this fun.

⚡

Native Performance

Transpiles to Go and compiles to native binaries. Your cat code runs at full speed.

🛠

First-Class Functions

Lambdas with paw(x) { x * 2 }, plus lick (map), picky (filter), and curl (reduce).

🚀

Pattern Matching

Powerful peek expressions with ranges, wildcards, and multi-case support.

🚧

Pipe Operator

Chain operations elegantly with |=|. Transform data in a readable, functional style.

📦

Standard Library

Built-in packages for file I/O and HTTP. Just nab "http" and start building.

See it in action

fizzbuzz.nyan
meow fizzbuzz(n int) string {
  sniff (n % 15 == 0) {
    bring "FizzBuzz"
  } scratch sniff (n % 3 == 0) {
    bring "Fizz"
  } scratch sniff (n % 5 == 0) {
    bring "Buzz"
  } scratch {
    bring to_string(n)
  }
}

purr i (1..20) {
  nya(fizzbuzz(i))
}
Open in Playground
fibonacci.nyan
meow fib(n int) int {
  sniff (n <= 1) {
    bring n
  }
  bring fib(n - 1) + fib(n - 2)
}

purr i (10) {
  nya(fib(i))
}
Open in Playground
kitty_example.nyan
kitty Cat {
  name: string
  age: int
}

nyan nyanchu = Cat("Nyanchu", 3)
nyan tyako = Cat("Tyako", 5)
nyan tyomusuke = Cat("Tyomusuke", 2)

nya(nyanchu.name + " is " + to_string(nyanchu.age) + " years old")
Open in Playground
functional.nyan
nyan numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

# Pipeline: filter evens, double them, sum
nyan evens = numbers |=| picky(paw(x) { x % 2 == 0 })
nyan doubled = evens |=| lick(paw(x) { x * 2 })
nyan result = doubled |=| curl(0, paw(acc, x) { acc + x })

nya(result)  # 60
Open in Playground

Get started in seconds

1

Install

brew install 135yshr/homebrew-tap/meow
2

Write

echo 'nya("Hello, World!")' > hello.nyan
3

Run

meow run hello.nyan
Read the Meow Programming Language Tutorial