CS10 Summer 2016: �The Beauty and Joy �of Computing

Git / Agile Development

Instructor: Ian Birnam

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Security experts have cloned all seven TSA master keys

“The TSA, offers a set of screener-friendly locks. These locks use one of seven master keys that only the TSA can use — until 2014. Last week, security researchers released the final 3D printed key.”

Article

7/28/2016

CS10 Su16 - Lecture 22

Administrivia

• Explore Post due TOMORROW!
• Midterm Regrades due TOMORROW!
• Explore Post Comments due Monday!
• If you haven’t viewed your graded midterm, please do so, and if you have trouble, email Lara!!!
• Start on Final Project!!

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Lecture Outline

• What is Git?
• How to Use Git
• What is Agile Development?
• Basics of Agile

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WHAT IS GIT?

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What is Git?

Git is a popular form of source control

• Source control is a way to record how a project changes and grows over time
• Track and save project at various phases of development
• What you wish you had for Snap! :D

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Disclosure on Git

Git is an incredibly powerful tool, and can get complex

• Have the power to re-write history!

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Thankfully, the basics can get you through 90% of the use cases you’ll need in your day-to-day

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We’ll cover enough to make you dangerous

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HOW TO USE GIT

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Terminology - repo(sitory)

repo(sitory) - where the project (code) lives

• origin - the codename for the main repository

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Not this simple, next slides detail these arrows:

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Terminology - branch

branch - a working copy of the code in the repository (can be multiple)

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Repository

branches

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Terminology - branch - master/remote/local

• master - permanent branch where the code lives
• Most up to date version of “ready” code
• remote - the copy of the code on GitHub (i.e. Remote Branch)
• local - copy of the code you download from GitHub and can edit on your own computer (i.e. Local Branch)
• can later be merged into master

master

Local (ian’s branch)

remote

remote

remote

Local (alex’s branch)

Local (lara’s branch)

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Commands

• clone - download a copy of the code from GitHub
• push - to upload your changes (code and/or images) on to master
• pull - to download the most recent version of master
• add and commit - to add an official copy and descriptive message about your work to your local branch

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Flow of Commands

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GIT DEMO

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Tools Used:

• Git
• Github For Desktop
• Visual Studio Code

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WHAT IS AGILE DEVELOPMENT?

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What’s Agile - Preface

• Going over big ideas
• Not an all-inclusive Agile talk
• Your experience may vary

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What’s NOT Agile?

“The waterfall model is a sequential design process, used in software development processes, in which progress is seen as flowing steadily downwards (like a waterfall) through the phases of conception, initiation, analysis, design, construction, testing, production/implementation and maintenance.”

• Wikipedia

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What’s NOT Agile? - Waterfall

• Teams of various size
• Each phase happens sequentially
• Little to no parallelization
• For each phase, everything must be accounted for up front

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What’s NOT Agile? - Waterfall

• Waterfall Development was used in the olden times
• Though many companies still use it today!
• Has gone in favor of Agile methodologies at numerous companies
• Waterfall has numerous setbacks
• Sloooooooooooow
• Hard to account for everything upfront
• Lack of communication between teams
• Software development is hard to timebox
• Don’t Go Chasing Waterfalls

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What’s Agile?

“Agile software development is a group of software development methods in which solutions evolve through collaboration between self-organizing, cross-functional teams. It promotes adaptive planning, evolutionary development, early delivery, continuous improvement, and encourages rapid and flexible response to change.”

– Wikipedia

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What’s Agile?

• Small Teams
• Keep a running list of tasks (Backlog)
• Plan in small chunks of time (Sprints)
• Quick, daily meetings (Stand-Ups)
• Figure out a timeline, but be able to adapt.
• Iterate, Iterate, Iterate

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What’s Agile? - Standups

• Daily meeting with your team to discuss that day’s game plan.
• Timeboxed to 15-20 minutes (Ideally…)
• Say what you did yesterday, what you’re going to do today, and if you’re blocked on anything.
• Longer discussion items get moved to the Parking Lot, held at the end of standup.

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What’s Agile? - Sprints

• Small chunk of time where the team’s focus is on a subset of tasks from the Backlog.
• Generally 2 weeks long.
• Sometimes 3, or even 1.
• Planning on first day of sprint: assignment/estimations
• Retrospective on the last: what went well, what could be improved?

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What’s Agile? - Sprints

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Credit: http://www.dgc.co.uk/

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Summary

• Git is an incredibly useful tool in software development for tracking the history of the project
• and allows for easy testing!
• Git is powerful and (can be) complex, but the basics will get you 90% of the way there
• Waterfall VS. Agile methodologies
• Waterfall is sequential
• Agile is iterative and adaptive
• Standups, Backlogs, Sprints, Oh my!

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Post-Summary

How do we manage the website?

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HTML/CSS/JS/Ruby/Tons of APIs...

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and GIT!!!!

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