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Prompt

Extend the native Array data type to allow a groupBy method so that when given an array of objects, you can group each array item by a specified property.

For example, given an array of Turing students:

let students = [
  { name: "Louisa", module: "4FE", track: "frontEnd" },
  { name: "Nathaniel", module: "3FE", track: "frontEnd" },

Prompt

Using recursion, find the greatest common denominator of two positive integers.

For example,

greatestCommonDenominator(9, 12) #=> 3

Read about Pascal's Triangle here

Write a function that, given a depth (n), returns an array representing Pascal's Triangle to the n-th level.

For example:

pascalsTriangle(4) #=> [1, 1, 1, 1, 2, 1, 1, 3, 3, 1];

	// =================================================================
	// require all necessary packages =================================
	// =================================================================

	const express = require('express');
	const cors = require('cors');
	const app = express();
	const jwt = require('jsonwebtoken');

	{
	"short_name": "FakeNews",
	"name": "Fake News - Your #2 Source for Fake News",
	"icons": [
	{
	"src": "img/logo-48x48.png",
	"type": "image/png",
	"sizes": "48x48"
	},
	{

	// =================================================================
	// require all necessary packages ==================================
	// =================================================================

	const express = require('express');
	const app = express();
	const bodyParser = require('body-parser');
	const jwt = require('jsonwebtoken');

	<!doctype html>
	<html>
	<head>
	<title>Firebase Google Auth</title>
	<style type="text/css">body,button,html{text-align:center}body,html{margin:50px;font-family:'Helvetica Neue'}button{border:0;background-color:pink;text-transform:uppercase;color:#fff;padding:15px 30px;margin:0 auto}#accountDetails{font-family:'Courier New';border:1px solid #eee;padding:20px;margin:20px auto;overflow-wrap:break-word}</style>
	</head>
	<body>
	<button id="signIn">Sign In</button>
	<div id="accountDetails"></div>

	{
	"parser": "babel-eslint",
	"extends": [
	"eslint:recommended",
	"plugin:react/recommended"
	],
	"plugins": [
	"react"
	],
	"env": {