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import React, { useCallback, useState, useEffect, useContext, createContext } from 'react'

const authContext = createContext()

// Hook for child components to get the auth object and re-render when it changes.
export default () => {
  return useContext(authContext)
}

// Provider component that wraps components and makes useAuth() available

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const useStorage = (key, initialValue, storage) => {
  // Pass initial state function to useState so logic is only executed once
  const [storedValue, setStoredValue] = useState(() => {
    try {
      const item = storage.getItem(key)
      return item ? JSON.parse(item) : initialValue
    } catch (error) {
      console.error(error)
      return initialValue
    }

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import { useEffect, useState, useCallback, useRef } from 'react'

export default (asyncFunction, immediate = true) => {
  const [loading, setLoading] = useState(false)
  const [result, setResult] = useState(null)
  const [error, setError] = useState(null)

  // Track a reference to whether the useAsync is actually on a mounted component.
  // useEffect below returns a cleanup that sets this to false. Before setting
  // any state, we check if the cleanup has run. If it has, don't update the state.

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let regex;

/* matching a specific string */
regex = /hello/; // looks for the string between the forward slashes (case-sensitive)... matches "hello", "hello123", "123hello123", "123hello"; doesn't match for "hell0", "Hello" 
regex = /hello/i; // looks for the string between the forward slashes (case-insensitive)... matches "hello", "HelLo", "123HelLO"
regex = /hello/g; // looks for multiple occurrences of string between the forward slashes...

/* wildcards */
regex = /h.llo/; // the "." matches any one character other than a new line character... matches "hello", "hallo" but not "h\nllo"
regex = /h.*llo/; // the "*" matches any character(s) zero or more times... matches "hello", "heeeeeello", "hllo", "hwarwareallo"

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# Option 1
netstat -tulpn | grep 9090

# Option 2
sudo lsof -i -P -n | grep 9090

# Option 
sudo nmap -sT -O localhost

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const { User } = require("src/db");

/**
 * Find all duplicates emails in the User
 * mongoose model (mapping users collection)
 *
 *
 * This aggregation function will groups the
 * documents comparing emaiils, sanitized
 * to lowercase; it adds the "_id" fields to

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(function () {
    'use strict';

    angular.module('some.module')
            .controller('LoginController', loginController);

    /** @ngInject */
    function loginController(localStorageService, AuthService) {
        
        ...

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Project Title

One Paragraph of project description goes here

Getting Started

These instructions will get you a copy of the project up and running on your local machine for development and testing purposes. See deployment for notes on how to deploy the project on a live system.

Prerequisites

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/**
 * Simple localStorage with Cookie Fallback
 * v.1.0.0
 *
 * USAGE:
 * ----------------------------------------
 * Set New / Modify:
 *   store('my_key', 'some_value');
 *
 * Retrieve:

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{
  "name": "testing-hapi-js-apis",
  "version": "1.0.0",
  "license": "MIT",
  "scripts": {
    "test": "ava --verbose test.js"
  },
  "dependencies": {
    "ava": "^0.16.0",
    "hapi": "^15.1.1"