Onuwa Nnachi Isaac iamonuwa

Day 1

Read How to answer a coding interview.
Read Using sliding window technique to solve coding interview questions.
Practice coding Array 1 Two Sum
Practice coding Array 2 Three Sum
Practice coding Array 3 Max Consecutive Ones III
Practice coding Array 4 Maximum Product Subarray

Day 2

Read Using state machine to solve complex coding interview questions.

Group Array of JavaScript Objects by Keys or Property Values

This fork of JamieMason's implementation changes the key parameter to be an array of keys instead just a single key. This makes it possible to group by multiple properties instead of just one.

Implementation

const groupBy = keys => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = keys.map(key => obj[key]).join('-');

Group Array of JavaScript Objects by Key or Property Value

Implementation

const groupBy = key => array =>
  array.reduce((objectsByKeyValue, obj) => {
    const value = obj[key];
    objectsByKeyValue[value] = (objectsByKeyValue[value] || []).concat(obj);
    return objectsByKeyValue;

	#! /usr/bin/env node
	// I am ./bin/buildSitemap.js

	const path = require('path')
	const glob = require('glob')
	const fs = require('fs')

	const SITE_ROOT = process.env.SITE_ROOT \|\| 'https://www.actionherojs.com'
	const SOURCE = process.env.SOURCE \|\| path.join(__dirname, '..', 'pages', '/*/.js')
	const DESTINATION = process.env.DESTINATION \|\| path.join(__dirname, '..', 'static', 'sitemap.xml')

	import { AfterViewInit, Directive, ElementRef, EventEmitter, forwardRef, Inject, Injectable, InjectionToken, Injector, Input, NgZone, OnInit, Output } from '@angular/core';
	import { AbstractControl, ControlValueAccessor, FormControl, NG_VALUE_ACCESSOR, NgControl, Validators } from '@angular/forms';
	import { Http } from '@angular/http';

	declare const grecaptcha : any;

	declare global {
	interface Window {
	grecaptcha : any;
	reCaptchaLoad : () => void

	function getCardType(cardNum) {

	if(!luhnCheck(cardNum)){
	return "";
	}
	var payCardType = "";
	var regexMap = [
	{regEx: /^4[0-9]{5}/ig,cardType: "VISA"},
	{regEx: /^5[1-5][0-9]{4}/ig,cardType: "MASTERCARD"},
	{regEx: /^3[47][0-9]{3}/ig,cardType: "AMEX"},

	/**
	* Example of using an angular provider to build an api service.
	* @author Jeremy Elbourn (@jelbourn)
	*/

	/** Namespace for the application. */
	var app = {};

	/******************************************************************************/

	import { Component, OnInit, OnDestroy } from '@angular/core';
	import {Http} from "@angular/http";
	import { LocalCacheService } from "./local-cache.service";

	@Component({
	selector: 'app-example',
	templateUrl: './app.component.html',
	styleUrls: ['./app.component.scss']
	})
	export class ExampleComponent implements OnInit, OnDestroy {

	[
	{name: 'Afghanistan', code: 'AF'},
	{name: 'Åland Islands', code: 'AX'},
	{name: 'Albania', code: 'AL'},
	{name: 'Algeria', code: 'DZ'},
	{name: 'American Samoa', code: 'AS'},
	{name: 'AndorrA', code: 'AD'},
	{name: 'Angola', code: 'AO'},
	{name: 'Anguilla', code: 'AI'},
	{name: 'Antarctica', code: 'AQ'},