This document provides short introductions and definitions for various programming concepts and tools, including: KLOC (thousands of lines of code) and the KISS principle for keeping programs simple; continuation-passing style (CPS) programming; definitions of web services and RESTful APIs; an overview of refactoring code and pseudocode; smoke testing and prototyping; and the differences between centralized (CVS) and distributed (DVCS) version control systems. The document is a reference for getting started with these common programming techniques and technologies.

1. © COPYRIGHT 2017 HeaderLabs Infotech
Short programming cookies
1

2. 2
Introduction

3. © COPYRIGHT 2017 HeaderLabs Infotech 3
List of Cookies
• KLOC & KISS
• CPS
• Web Services
• Restful APIs
• Refactoring
• Pseudocode
• Smoke testing
• Prototyping
• VCS: CVS vs DVCS
• …

4. 4
Getting Started

5. © COPYRIGHT 2017 HeaderLabs Infotech 5
KLOC & KISS
KLOC
(thousands of lines of code)
a traditional measure of how large a computer program is or
how long or how many people it will take to write it,
sometimes used as a rough measure of programmer
productivity.
KISS Principle (Keep It Simple, Stupid)
The principle is best exemplified by the story of aircraft
engineer Kelly Johnson( U.S. Navy 1960 ) for Lockheed
U-2( dragon lady )
The principle that people want products that are easy to
learn and use, and that companies realise time and cost
benefits by producing such products.
Variations on the phrase include: "Keep it Simple, Silly",
"keep it short and simple", "keep it simple and
straightforward"[5] and "keep it small and simple".

6. © COPYRIGHT 2017 HeaderLabs Infotech 6
CPS
• Continuation-passing style (CPS) is a style of programming in which control is passed
explicitly in the form of a continuation.
var fs = require(‘fs');
fs.readFile('/etc/passwd', function(err, fileContent) {
if (err)
{
throw err;
}
console.log('file content', fileContent.toString());
});

7. © COPYRIGHT 2017 HeaderLabs Infotech 7
Web Services
According to wiki, a web service is a service offered by an electronic device to another electronic device,
communicating with each other via the World Wide Web. In a Web service, Web technology such
as HTTP, originally designed for human-to-machine communication, is utilised for machine-to-machine
communication, more specifically for transferring machine readable file formats such as XML and JSON.

8. © COPYRIGHT 2017 HeaderLabs Infotech 8
Restful API
• REST stands for REpresentational State Transfer.
• As per the REST Architecture everything is a resource.
• A REST Server simply provides access to resources and the REST client accesses
and presents the resources. Here each resource is identified by URIs/ Global IDs.
• Web service APIs that adhere to the REST architectural constraints are called
RESTful APIs

9. © COPYRIGHT 2017 HeaderLabs Infotech 9
Refactoring
• …is a disciplined technique for restructuring an existing body of code, altering its
internal structure without changing its external behaviour.
• It includes the best practices to implement at the right place with right piece of
code
• It also includes to apply preventive code mechanism to avoid any kind of risk/bug.
• For more please visit… https://refactoring.com/catalog/

10. © COPYRIGHT 2017 HeaderLabs Infotech 10
Pseudocode
• … is the structural conventions of a normal programming language, but is intended for
human reading rather than machine reading.

11. © COPYRIGHT 2017 HeaderLabs Infotech 11
Smoke testing
• … is on-exhaustive software testing, ascertaining that the most crucial functions of a
program work, but not bothering with finer details.

12. © COPYRIGHT 2017 HeaderLabs Infotech 12
Prototyping
• …is a systems development method
(SDM) in which a prototype (an
early approximation of a final
system or product) is built, tested,
and then reworked as necessary
until an acceptable prototype is
finally achieved from which the
complete system or product can
now be developed.

13. © COPYRIGHT 2017 HeaderLabs Infotech 13
VCS: CVS vs DVCS
• VCS: Version control is a system that
records changes to a file or set of files
over time so that you can recall specific
versions later.
• Local Version Control System: Manually
kept files with date-time stamp, RCS
• Centralised Version Control
System(CVCs): CVS, Subversion, Perforce.
• Distributed Version Control
System(DVCS): Git, Mercurial, Bazzar,
Darcs

14. 14
Thank You.