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TIME DRIVEN DEVELOPMENT @ktrajchevska

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Exclusive Developers’ Network Katerina Trajchevska ● 1x Engineer & Mozilla Tech Speaker ● Co-founder of Adeva, an exclusive developers’ network. ● Consultant with startups and Fortune 500 @ktrajchevska

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@ktrajchevska What are we going to talk about? 1. How to design software for easy maintenance, extension and modification. 2. How to know when to stop and make better use of your time.

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Example #1 Developing a module for managing user profiles

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App\ZohoCandidate.php

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App\Http\Controllers\CandidateController.php ! We directly depend on the CRM storage.

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profile.blade.php ! Using arrays to access the data.

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App\Http\Controllers\CandidateController.php

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@ktrajchevska Red Flags Controller knows too much and is open for modification. Methods depend directly on the CRM storage and their naming conventions. View uses arrays that should be replaced with Collections in future.

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Demo #1 Changing the storage to MySQL

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@ktrajchevska What does it take to switch the storage? 1. Add Eloquent models to use with MySQL. 2. Change controller dependencies from CRM class to Eloquent. 3. Use Eloquent instead of CRM to pull data for the view. 4. Switch all variables to the new naming convention. 5. Change the way we access data in the views. 6. Adjust the unit tests to work accordingly.

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How can we save time by improving the code design?

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1. Don’t depend on concrete implementations.

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App\Repositories\Interfaces\CandidateRepositoryInterface.php

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App\Http\Controllers\CandidateController.php

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App\Http\Controllers\CandidateController.php

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2. Be mindful about what your program expects.

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App\Crm\Candidate.php

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profile.blade.php

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3. Bind abstractions with concrete implementation.

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App\Providers\AppServiceProvider.php

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Demo #2 Changing the storage to MySQL

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@ktrajchevska What does it take to switch the storage? 1. Add Eloquent models to use with MySQL. 2. Create MysqlCandidateRepository that implements CandidateRepositoryInterface. 3. Change the binding for CandidateRepositoryInterface in AppServiceProvider.

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Example #2 Developing a module for integrating Github

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Integrations\VersionControl\VersionControlFactory.php

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App\Integrations\Interfaces\AbstractVersionControl.php

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Integrations\VersionControl\Github.php

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App\Http\Controllers\Admin\CandidateController.php

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You Aren’t Gonna Need It

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Is there a better way to do it?

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App\Http\Controllers\Admin\CandidateController.php

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Why Time Driven Development?

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@ktrajchevska Why Time Driven Development? ● Software design practices come with trade-offs. Know them. ● Software design principles should simplify your life, not complicate it. ● Thinking about the bigger picture will help you create more than just software. It will help you create value.

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Software Design Principles are your tools, not your goals.

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@ktrajchevska How to start practicing Time Driven Development? ● Talk to your lead to understand the business goals before proposing an architecture. ● Always have the context in mind when designing software. ● Don’t shame others for not adhering to “the best” software design practices.

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Thanks! @ktrajchevska adeva.co Exclusive developers’ network.