Introduction Backend Development

Lecture 1 Akirachix

Transcript

1. Introduction Backend Development Chencha Jacob 1
2. What is backend development What is backend development • Typically interacts with other machines • Holds business logic • Runs on server 2
3. Why backend development Why backend development • Protect your IP • Runs powerful machines • Easily scalable (if written right) • Serve many clients 3
4. How How • Code written on remote machine • Typical languages include PHP, Python, Ruby, Java, JS 4
5. Major Areas Major Areas • Database • Routing • Queuing • Validation • APIs (Interaction with frontend and other applications) Figure 1: sqllite 5
6. Tools Tools • Languages : PHP, Python, Ruby, Java, JS • Editors: Netbeans, PHPStorm, SublimeText, VIM • Frameworks: Laravel, RoR, Django 6
7. Tools ##Install PHP, MySQL, Apache • Please see https://www.digitalocean.com/community/tutorials/ how-to-install-linux-apache-mysql-php-lamp-stack-on-ubuntu • Install POSTMan https://www.getpostman.com/ 7
8. Task 1 Basic Computation Task 1 Basic Computation Create a html/cli program that takes in two numbers and outputs their sum. 8
9. Task 1 Sample solution Task 1 Sample solution 1. Write out php file with the code <?php $sum=$_REQUEST[ val1 ]+$_REQUEST[ val2 ]; echo $sum; 2. Name the file add_two.php 3. Serve the file php -S 0.0.0.0:8888 -t . add_two.php 9
10. Task 2 Sum numbers Task 2 Sum numbers Write script that takes in an integer and gives the sum of all numbers preceding it. The number itself inclusive. eg Given 5 The system would return 15, (5+4+3+2+1) 10
11. Task 2 Suggested solution Task 2 Suggested solution <?php $number=$_REQUEST[ number ]; $total=0; for ($i = 0; $i < $number; $i++) { $total+=$i; } echo $total; //Alternative solution echo "<hr>"; $total=$number * ($number-1) * 0.5; echo $total; The steps for serving this file are the same as previous 11
12. Assignment Assignment Write a php application that accepts comma delimited string and gives us their average eg Accepts string such as “12,15,25” and prints out 17.33333 12
13. Thank You Thank You 13