Flyrell

/**
 * DEMO: https://jsfiddle.net/gd6b71Ln/38/
 *
 * CAUTION: You will need to edit `el.style.transform = 'rotate('+ deg +'deg)'`, 
 *          in case the element has already existing transform styles (just append them)
 *
 * COMPATIBILITY: https://caniuse.com/#feat=getboundingclientrect
 *                https://caniuse.com/#feat=transforms2d
 *
 * Makes the element rotate based on the mouse position

Flyrell

// Simple if condition that stops Observable from continuing passed condition function returns false.
// There's also an option to run else callback if needed.

/*
 * USAGE
 * 
 * of(events).pipe(
 *   ifCondition(event => event.name.endsWith('anything'), () => console.log('Not the anything event'))
 * )
 */

Flyrell

const AVATAR_SIZE = 140;

function onFileChange(input: HTMLInputElement): Promise<string> {
  const fileReader = new FileReader();
  fileReader.readAsDataURL(input.files.item(0));
  return new Promise((resolve) => {
    fileReader.onload = (event) => {
      const image = new Image();
      image.src = event.target.result as string;
      image.onload = () => {

Flyrell

function* getAllPossibleCombinations(arr, outputLength = arr.length) {
  if (outputLength > arr.length) {
    throw 'Not enough items in array';
  }
  
  for (let i = 0; i < arr.length; i++) {
    if (outputLength === 1) yield arr[i];
    
    for (let j = 0; j < arr.length; j++) {
      if (i === j) continue;

Flyrell

#!/usr/local/bin/node

const fs = require('fs');
const path = require('path');
const arguments = process.argv.slice(2);

const folder = arguments[0];
const filePrefix = arguments[1];

const map = {