The purrfect programming language.

MeowScript is a small scripting language where purrhaps means if, pawction means function, and every program announces itself with a meow. The interpreter is written in Rust and runs right here, in your browser.

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Cat to human

Every keyword is a pun, and every pun means exactly one ordinary thing. This is the whole vocabulary.

Cat	Human	Looks like
scratch	declare a variable	`scratch lives = 9;`
amew	change it	`amew lives = lives - 1;`
pawction	function	`pawction greet(name) { meow("Hi", name); }`
tail	return	`tail lives * 2;`
purrhaps / meowtually	if / else	`purrhaps hungry { meow("feed me") } meowtually { nap(10) }`
furrever	loop, with an optional condition	`furrever lives > 0 { amew lives = lives - 1; }`
fur ~	for each	`fur toy ~ toys { meow(toy); }`
hiss / continue	break / continue	`purrhaps tired { hiss; }`
purrfect / clawful	true / false	`scratch asleep = purrfect;`
mew	null	`scratch owner = mew;`
furreal	typeof	`furreal "whiskers" // "whiskers"`
pawckage	import	`pawckage "nya:furrball";`
's	property access	`cat's name`
~	is in	`"Tom" ~ cats`
whiskers	a string	`"meow"`
furrball	an array	`["yarn", "box", "sunbeam"]`

Put together, it reads like this:

pawckage "nya:furrball"; scratch cats = ["Tom", "Luna", "Salem"]; pawction introduce(cat) {    purrhaps cat == "Salem" {        tail cat + " (a witch's familiar)";    }    tail cat;} fur cat ~ cats {    meow("This is", introduce(cat));} meow("That's", length(cats), "cats, and", "Luna" ~ cats, "that Luna is one of them.");

Batteries, in a bag of nya

meow, purr, and length are always there. Everything else is a pawckage away.

nya:clawtility
Input, timing, objects, and other everyday tools.
length, kibble, nap, now, keys, values, remove, assert, apply
nya:furrball
Everything for furrballs (arrays).
push, pounce, top, last, bottom, includes, index_of, map, filter, reduce, each, find, range, reverse, sort, join, slice, concat
nya:whiskers
Everything for whiskers (strings).
in_whiskers, pawrse, replace, split, upper, lower, trim, starts_with, ends_with, includes, index_of, chars, repeat, pad_start, pad_end, reverse, slice
nya:catculator
Maths. Angles are in radians.
random, round, ceil, floor, trunc, abs, sqrt, sin, cos, tan, log2, log10, ln, exp, pow, modulo, min, max, clamp, PI, TAU, E, INFINITY
nya:rundamn
Random numbers, choices, and shuffles.
seed, random, uniform, randint, choice, shuffle
nya:scratchpad
Reading and writing files. Not available in the browser.
read_file, write_file, append_file, exists

Run it on your own machine

The command line build adds a REPL and file access. Prebuilt binaries for Windows, macOS, and Linux are on the download page, or build it with cargo:

cargo install --git https://github.com/AlenVelocity/MeowScript meowscript-cli

meowscript                 # the REPL
meowscript hello.meow      # run a file
meowscript packages        # what's in the nya: pawckages

The full language reference is in the docs.