Jazzy Jones samjaninf

Studying for a Tech Interview Sucks, so Here's a Cheat Sheet to Help

This list is meant to be a both a quick guide and reference for further research into these topics. It's basically a summary of that comp sci course you never took or forgot about, so there's no way it can cover everything in depth. It also will be available as a gist on Github for everyone to edit and add to.

Data Structure Basics

###Array ####Definition:

Stores data elements based on an sequential, most commonly 0 based, index.
Based on tuples from set theory.

	// https://inkplant.com/code/ipv6-to-number
	<?php

	function ipaddress_to_ipnumber($ipaddress) {
	$pton = @inet_pton($ipaddress);
	if (!$pton) { return false; }
	$number = '';
	foreach (unpack('C*', $pton) as $byte) {
	$number .= str_pad(decbin($byte), 8, '0', STR_PAD_LEFT);
	}

	// https://inkplant.com/code/get-timezone
	<?php

	function get_timezone($latitude,$longitude,$username) {

	//error checking
	if (!is_numeric($latitude)) { custom_die('A numeric latitude is required.'); }
	if (!is_numeric($longitude)) { custom_die('A numeric longitude is required.'); }
	if (!$username) { custom_die('A GeoNames user account is required. You can get one here: http://www.geonames.org/login'); }

	<?php
	$formaction = $_SERVER['PHP_SELF']; //the URL the form should send users to on submit
	$allowedfiletypes = array('csv'); //a comma separated list of allowed extensions
	$uploadfolder = './'; //the folder where the uploaded file should be moved to
	$uploadfilename = 'data.csv'; //the filename that the uploaded file should be renamed to

	//check to see if the form has been submitted
	if (array_key_exists('action',$_POST) && is_string($_POST['action']) && (strip_tags($_POST['action']) == 'upload')) { //the form has been submitted
	echo '<p>Uploading file... ';
	if (empty($_FILES['uploadfile']['name'])) {


	/**
	* Convert data in CSV (comma separated value) format to a javascript array.
	*
	* Values are separated by a comma, or by a custom one character delimeter.
	* Rows are separated by a new-line character.
	*
	* Leading and trailing spaces and tabs are ignored.
	* Values may optionally be enclosed by double quotes.
	* Values containing a special character (comma's, double-quotes, or new-lines)

	<?php

	// TSV to Array Function
	// Copyright (c) 2015, Ink Plant
	// https://inkplant.com/code/
	// this version was last updated June 23, 2015

	function tsv_to_array($file,$args=array()) {
	//key => default
	$fields = array(

	var to_array = function(text, delimeter, has_header, header_size) {
	var lines = text.split('\n');
	var columns = has_header ? lines[header_size - 1].split(delimeter) : null;
	var rows = [];

	for (var i=header_size; i<lines.length; i++) {
	var array = lines[i].split(delimeter);
	var row = {};

	for (var j in array) {

	#### Exercises

	1. Define and compare recursion and iteration.

	Recursion is a procedure that calls itself until a certain condition (base case) is reached. Recursive solutions can be slower and are subjected to system limitations

	Iteration is a procedure that uses loop to repeat a process. Iterative solutions may be harder to implement.


	2. Name five algorithms that are commonly implemented by recursion.

	cd ~
	adduser --system --shell=/bin/bash --home-dir=/opt/odoo --user-group odoo
	yum -y groupinstall "development tools"
	yum -y install https://centos7.iuscommunity.org/ius-release.rpm
	yum -y install python36u python36u-pip python36u-devel wget unzip postgresql-devel npm nodejs git libjpeg-devel libxml2-devel libxslt-devel openldap-devel cyrus-sasl-devel
	pip3.6 install --upgrade pip
	ln -s /usr/bin/python3.6 /usr/bin/python3
	wget -nc https://github.com/odoo/odoo/archive/11.0.zip -O archive.zip
	unzip -nq archive.zip
	mkdir -p /opt/odoo

	server {
	listen 80;
	listen 443 ssl http2;
	server_name your.mautic.location;
	root /your/mautic/path ;
	server_tokens off;
	add_header 'Access-Control-Allow-Headers' 'Authorization,Content-Type,Accept,Origin,User-Agent,DNT,Cache-Control,X-Mx-ReqToken,Keep-Alive,X-Requested-With,If-Modified-Since';
	add_header 'Access-Control-Allow-Methods' 'GET, POST, OPTIONS';