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public class Trello
{
    public String Letters { get; set; }

    public Int64 InitialHash { get; set; }
    public Int64 Hash { get; set; }
    public Int64 HashDepth { get; set; }

    public Trello(String letters, Int64 initialHash, Int64 hashDepth)
    {

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/build

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Install MongoDB on macOS Sierra

This procedure explains how to install MongoDB using Homebrew on macOS Sierra 10.12.
Official MongoDB install documentation: here

Install Homebrew

• Installing Homebrew is effortless, open Terminal and enter :
  $ /usr/bin/ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"

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# If you come from bash you might have to change your $PATH.
# export PATH=$HOME/bin:/usr/local/bin:$PATH

# Path to your oh-my-zsh installation.
export ZSH=/Users/admin/.oh-my-zsh
export PATH=`pwd`/flutter/bin:$PATH
export ANDROID_HOME=/android-sdks

source /usr/local/opt/chruby/share/chruby/auto.sh

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#!/bin/bash

usage() { echo "usage: --coursename [--coursename \"build-a-react-app-with-redux\"] --type [--type \"courses|lessons\"]" 1>&2; exit 1; }

OPTS=$(getopt -o c:t: --long coursename:,type: -n 'download_egghead_videos.sh' -- "$@")

if [ $? != 0 ] ; then echo "Terminating..." >&2 ; exit 1 ; fi

eval set -- "$OPTS"

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let UserContext = React.createContext();

class App extends React.Component {
  state = {
    user: null,
    setUser: user => {
      this.setState({ user });
    }
  };

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const array = [
  { id: 1, category: 'Apple' },
  { id: 1, category: 'Orange' },
  { id: 3, category: 'Orange' },
  { id: 4, category: 'Grape' },
  { id: 5, category: 'Grape' },
]

function groupBy(array, key) {
  const keys = (array, key) => array.reduce((acc, item) => acc.add(item[key]), new Set());

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// hooks.js
import { useCallback, useEffect, useReducer, useRef } from "react";

export function useRefMounted() {
  // To prevent state update when component is unmounted
  const isMounted = useRef(true);

  useEffect(() => {
    return () => {
      // called when the component is going to unmount

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const {
  map,
  prop,
  compose,
  pluck,
  sort,
  ascend,
  multiply,
  cond,
  T,

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function memoize(fn) {
  let cache = {}
  return function (...args) {
    if (cache[args]) {
      return cache[args]
    }
    const res = fn.apply(this, args)
    cache[args] = res
    return res
  }