mypy-play

from typing import TypeVar, Union

T = TypeVar("T")

Thing = Union[str, int]

MaybeTuple = Union[T, tuple[T]]

def untuple(item: MaybeTuple[T]) -> T:
    if isinstance(item, tuple):

deadpixi

UUIDv4 Generation in Three Different Array Languages

Here we see the same UUIDv4 generation function written in three different APL(-like) languages: APL, J, and K.

The algorithm is very simple, but one that lends itself well to implementation in an array language:

• Generate a list of 36 random numbers between 0 and 15.
• Transform each of those digits into a single-character string of the corresponding hex digit.
• Join those characters together into a 36-character string.
• Replace some of the characters with dashes.
• Replace the character representing the version nybble with 4 (to indicate a version 4 UUID).
• Constrain the character whose top two bits represent the variant to one that indicates the UUID is an RFC4122 UUID.

DavidBuchanan314

import os
import sys

"""
This (pure!) python script streams a gzip-compressed YUV4MPEG video to stdout.
It easily runs at 1080p60fps on my machine.

Pipe it into a media player like this:

python3 gzip_swar_life.py | mbuffer | gunzip - | mpv -

hwayne

It's time to drag the Island of Knights and Knaves kicking and screaming into the 19th century! We're going to run a train. For these puzzles, you'll have a set of stations with possible connections, and you need to find a route that starts at one station, goes through every other station exactly once, and ends in a station. IE if our map was

A -- B -- C
|    |    |
D -- E -- F

Valid routes might be A B C F E D, or A D E B C F, but A B E D C F is invalid. The ordering matters: A B C is a different route from C B A.

jckarter

fml

The function manipulation language

"I just implemented Conway's Game of Life in two lines of code. #fml"

pad = x flip[stitch] 0, stitch 0, flip[cat] 0, cat 0
life = pad, neighborhoods[3 3], [ravel, [sum in?: [x @ 4, + 3; 3]]]/2

mikelikespie

/*
 * To try it:
 * c = $c.sRGB8(23,58,32);
 * c.Lab();
 * c.Lab().sRGB8();
 */

var $c = {};
(
 function () {