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Principles of Software Design

You've heard the terms before: YAGNI, SOLID, Tell Don't ASK, DRY... what are they and what do they mean?

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As you build applications using the patterns we learned in the previous videos, you begin to see some common side effects.

For instance: the Strategy, Adapter, Mediator and Bridge Patterns lead you to think a little bit more about better ways to manage dependencies between classes. You also begin to create rules and reasons why code should even exist in the first place.

Obviously, this is not a small topic. In this chapter we’ll discover the key principles you should understand, who came up with them, and why. These concepts include Coupling, Cohesion, Tell Don’t Ask, YAGNI, and SOLID.

The Code

You can find the code for each of the demos up on GitHub.

  • Design Patterns: Creational

    Tried and true design patterns for creating objects in an object-oriented language.

  • Design Patterns: Structural

    As your application grows in size you need to have a plan to handle the increase in complexity. The Gang of Four have some ideas that could work for you.

  • Design Patterns: Behavioral

    Mediators, Decorators and Facades - this is the deep end of object-oriented programming and something you'll come face to face with as your application grows.

  • Principles of Software Design

    You've heard the terms before: YAGNI, SOLID, Tell Don't ASK, DRY... what are they and what do they mean?

  • Testing Your Code: TDD and BDD

    Testing code has moved beyond the realm of QA and into the realm of design, asking you to think about what you do before you do it. Let's have a look at some strategies.

  • Shell Script Basics

    It's a Unix world. You should have a functional knowledge of how to get around a Unix machine using the command line, as well as how to complete basic tasks using shell scripts and Make files.

  • Hands On: Creating a Useful Shell Script

    I use the static site generator Jekyll to write my blog. I store the site at Github, who then translates and hosts it all for me for free. Jekyll is simple to use and I like it a lot. There's only one problem: it's a bit manual.

  • Deciphering a Complex Bash Script

    I use the static site generator Jekyll to write my blog. I store the site at Github, who then translates and hosts it all for me for free. Jekyll is simple to use and I like it a lot. There's only one problem: it's a bit manual.

  • Making Your Life Easier with Make

    Make is a build utility that works with a file called a Makefile and basic shell scripts. It can be used to orchestrate the output of any project that requires a build phase. It's part of Linux and it's easy to use.

  • Using Make to Improve Your Test Suite

    Make has been around forever and is often overlooked in favor of tools that recreate precisely what it does, but in crappier ways. Let's see how you can use Make to help your testing process.

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