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javascript: (function () {
  function convert(currentElement) {
      if (!currentElement.textContent) return;
      /* 
       * Match mpg strings with negative lookahead for the l/100km conversion string
       * to avoid duplicating the conversion when run multiple times.
       * E.g. "N.N mpg" not followed by " (N.N l/100km)" 
       */
      const mpgRegex = /(\d*(\.\d+)?)(\s)*mpg(?!\s\(\d+\.\d+\sl\/100km\))/gi;
      const currentText = currentElement.textContent;

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Initial Raspberry Pi 3 Setup with Raspbian

Flash Raspbian and connect to network via ethernet

1. Download the latest Lite version from https://www.raspberrypi.org/software/operating-systems/
2. Use the "balenaEtcher" app (https://www.balena.io/etcher/) to flash the iso to a microSD card
3. Copy a blank file named ssh to the boot partition (the root folder of the microSD card)
4. Power up the Raspberry PI, find it's IP in your router's connected devices, and ssh pi@<ip> (password: raspberry)

Initial Hardware and Raspbian configuration

1. sudo raspi-config
2. System Options > Change user password

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dig myip.opendns.com @208.67.222.222 +short

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// zip for 2 arrays
function zip2<A, B>(a: A[], b: B[]): Array<[A, B]> {
  return a.map((_, c) => [a, b].map(row => row[c])) as Array<[A, B]>;
}

// zip for any number of arrays
type Zip<T extends unknown[][]> = { [I in keyof T]: T[I] extends (infer U)[] ? U : never }[];
function zip<T extends unknown[][]>(...args: T): Zip<T> {
    return <Zip<T>><unknown>(args[0].map((_, c) => args.map(row => row[c])));
}

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// After running this guy's Google Play Music export https://gist.github.com/dcalacci/7f8853174797c0c56c49
// His export to CSV function doesn't format the lines properly
// Paste the following function in the console and run 'songsToCsv(all_songs)'
function songsToCsv(data) {
    const out = [];
    const seen = new Set();

    const keys = [
        'artist', 'album', 'title', 'duration', 'playcount', 'rating'
    ];

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/**
 * date-fns v2 is still in alpha, but has built-in Typescript support so best to use it:
 * Docs: https://date-fns.org/v2.0.0-alpha.16/docs/Getting-Started
 *
 * npm install --save date-fns@next 
 */

// Useful functions to import
import { formatDistanceStrict, isAfter, isBefore, format, subDays, isSameDay } from 'date-fns';

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// Updated the original to include the new 'sticky' style in addition to 'fixed' https://alisdair.mcdiarmid.org/kill-sticky-headers/
// Note to run this as a Chrome bookmark paste it in the URL field, prefixed with: javascript:
(function () {
    var i, elements = document.querySelectorAll('body *'); for (i = 0; i < elements.length; i++) {
        if (["sticky", "fixed"].includes(getComputedStyle(elements[i]).position)) {
            elements[i].parentNode.removeChild(elements[i]);
        }
    }
}
)();

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// Place your settings in this file to overwrite the default settings
{
    "window.zoomLevel": 0,
    "typescript.referencesCodeLens.enabled": false,
    "editor.cursorBlinking": "solid",
    "editor.minimap.enabled": false,
    "workbench.colorCustomizations": {
        "editor.lineHighlightBackground": "#585a6941"
    }
}

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Basic Types

All Basic Type keywords

From https://www.typescriptlang.org/docs/handbook/basic-types.html

const bool: boolean = true;
const num: number = 5;
const str: string = 'apple';
const numArr: number[] = [1, 2, 3];
const f: Function = () => 1;

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// promisified fs.writeFile
export function writeFile(filename, data): Promise<void> {
    return new Promise<void>((resolve, reject) =>
        fs.writeFile(filename, data, (err) => (err) ? reject(err) : resolve())
    );
}

// promisified fs.readFile
function readFile(filename): Promise<string> {
    return new Promise<string>((resolve, reject) =>