robinpokorny

class UUIDv7Generator {
    // constants
    #MAX_COUNTER = 0xFFFF_FFFF_FFFF;
    #BATCH_LIMIT = 10_000;
    
    // timestamp state
    #lastTimestamp = -1;
    #timestampHex1 = ``; // 8 chars
    #timestampHex2 = ``; // 4 chars
    

robinpokorny

const talkStart = Temporal.ZonedDateTime.from({
  timeZone: `Europe/Prague`,
  year: 2025,
  month: 5,
  day: 28,
  hour: 2,
  minute: 20,
})

console.assert(talkStart.toString() === `2025-05-28T02:20:00+02:00[Europe/Prague]`)

robinpokorny

Internationalization Puzzles 2025

Puzzle 1

const textEncoder = new TextEncoder();

input.split('\n').map(line => [textEncoder.encode(line).length <= 160, line.length <= 140]).map(([s, t]) => s ? (t ? 13 : 11) : (t ? 7 : 0)).reduce((a, b) => a + b, 0)

Puzzle 2

robinpokorny

const subscriptNumber = (n) => n
  .toString(10)
  .split``
  .map((i) => Number.parseInt(i, 10))
  .map((i) => String.fromCharCode(0x2080 + i))
  .join``

const countBadges = (badges) => Array
  .from(
    [...new Intl.Segmenter().segment(badges)]

robinpokorny

const uuid7Re = /^[0-9a-f]{8}-[0-9a-f]{4}-7[0-9a-f]{3}-[89ab][0-9a-f]{3}-[0-9a-f]{12}$/i;

const parseUuid7Date = (uuid) => {
  if (typeof uuid !== `string` || !uuid7Re.test(uuid)) {
    throw new TypeError(`Expected UUIDv7. Received: ${String(uuid)} (${typeof uuid})`)
  }
  
  const timestampHex = uuid.slice(0, 13).replace(`-`, ``)
  const timestamp = Number.parseInt(timestampHex, 16)
  return new Date(timestamp)

robinpokorny

const uuid4to7 = (uuid, now = Date.now()) => {
  const ts = now.toString(16).padStart(12, `0`)

  return `${ts.slice(0, 8)}-${ts.slice(8)}-7${uuid.slice(15)}`
}

// generate new UUIDv7
uuid4to7(crypto.randomUUID())

// Conforms to example in the spec RFC9562 A.6

robinpokorny

/*
  =============================
   Railway Oriented Typescript
  =============================
               by @robinpokorny
*/

/* === 1. Union basics === */

const a: string | number = 42;

robinpokorny

#!/bin/bash
# Mirrors all GitHub repositories the current user has read access to.
# See license at the end of the file.

# Token from https://github.com/settings/tokens
OAUTH_TOKEN="<TODO TOKEN>"

# where should the files be saved
DIR="<TODO PATH>"

robinpokorny

/*
  =============================
   Railway Oriented Typescript
  =============================
               by @robinpokorny
*/

/* === 1. Union basics === */

const a: string | number = 42;

robinpokorny

// And you will know my name is TypeScript
// When I lay my Tagged Union upon thee
// by @robinpokorny

// 1. Union of literals
// The cornerstone of any nutritious breakfast.
type Burger1 = `McDonalds` | `BigKahuna`;

const brettsBreakfast1_1: Burger1 = `BigKahuna`;
const brettsBreakfast1_2: Burger1 = `Whooper`; // Caught