Xetera

const chunk = (array, num) => array.reduce((array, current) => {
  const last = array[array.length - 1];
  const init = array.slice(0, -1);
  if (!last) {
    return [...init, [current]]
  }
  if (last.length >= num) {
    return [...array, [current]]
  }
  return [...init, [...last, current]];

Xetera

{-
  Using Optimal Stopping for finding the highest number in a list
  1. Generate an integer list of N size
  2. Reveal the numbers of the first N/e elements
  3. Keep revealing numbers until you find one bigger than the biggest revealed number
  4. The chances of the first matching number being the highest number in the list will consistently be 1/e
-}

-- Games played: 1000
-- Games Won: 358

Xetera

makePattern :: [(a -> a)] -> a -> [a]
makePattern funcs seed = scanl (\a f -> f a) seed (cycle funcs)

-- makePattern [(*3), (+1)] 1
-- [1,3,4,12,13,39]

Xetera

Keybase proof

I hereby claim:

• I am xetera on github.
• I am xetera (https://keybase.io/xetera) on keybase.
• I have a public key whose fingerprint is DE0C C5B3 7058 805B 8DD8 E306 7FB1 9FBF D8E5 BBED

To claim this, I am signing this object:

Xetera

data Stack a
  = Nil
  | Stack a (Stack a)

instance Functor Stack where
  fmap f s =
    case s of
      Stack e next ->
        Stack (f e) $ fmap f next
      Nil -> Nil

Xetera

const routeMethods = (router, url) => {
  const unwrap = () => router
  const makeRoute = method => handler => {
    router[method](url, handler);
    return routeMethods(router, url)
  }
  const methods = ['get', 'post', 'put', 'options', 'delete', 'patch', /* as many methods as you need here */]
  return methods.reduce((all, method) => ({
    ...all,
    [method]: makeRoute(method)

Xetera

Free Coronavirus Stats API

Website

https://gisanddata.maps.arcgis.com/apps/opsdashboard/index.html#/bda7594740fd40299423467b48e9ecf6

The website currently makes 3 separate API calls to retreive Death, Confirmed and Recovered cases, however ArcGIS supports multiple queries in one request so the API call has been optimized to retreive all 3 at once.

API Endpoint

https://services1.arcgis.com/0MSEUqKaxRlEPj5g/arcgis/rest/services/ncov_cases/FeatureServer/1/query?f=json&outStatistics=%5B%7B%22statisticType%22%3A%22sum%22%2C%22onStatisticField%22%3A%22Confirmed%22%2C%22outStatisticFieldName%22%3A%22confirmed%22%7D%2C%20%7B%22statisticType%22%3A%22sum%22%2C%22onStatisticField%22%3A%22Deaths%22%2C%22outStatisticFieldName%22%3A%22deaths%22%7D%2C%20%7B%22statisticType%22%3A%22sum%22%2C%22onStatisticField%22%3A%22Recovered%22%2C%22outStatisticFieldName%22%3A%22recovered%22%7D%5D

Xetera

:root {
  --rose-50: #fff1f2;
  --rose-100: #ffe4e6;
  --rose-200: #fecdd3;
  --rose-300: #fda4af;
  --rose-400: #fb7185;
  --rose-500: #f43f5e;
  --rose-600: #e11d48;
  --rose-700: #be123c;
  --rose-800: #9f1239;

Xetera

#!/usr/bin/env bash
# This backup file is run daily as a cronjob like:
# 0 0 * * * bash ~/backup.sh >> /var/log/restic_backups.log 2>&1

restic_repository="your-s3-repository-url-here"

# There is probably a way to do this conveniently through stdin but I don't know if
# that's more efficient through a file because mongodb does some questionable stuff
# with piping mongodump to stdout vs saving backups to a file
backup_path="/path/to/emit/backup/file"

Xetera

// Aggregates are a powerful mongodb tool that allows us to craft complex queries.
// In this case it helps prevent repetition in a situation where we would have to
// query a document with a filter, then use a duplicate `Array.find` logic to 
// extract the subdocument we were already expecting to find in the first place.

// Example person document
{
  name: "jason",
  pets: [{
    type: "dog",