# Abstract, Extract ## Lifesum, Stockholm ### April 2017 Daniel Saidi · [@danielsaidi](https://twitter.com/danielsaidi)

# Daniel Saidi ### iOS Lead @ BookBeat

# Windows Mobile 2005 ## Before it was cool

# Team Yellow ## With Mariah ❤️

# So why am I here?

# Code quality * Very important to me (too important) * Constant work in progress * ...and yet, I often suck at it * Strange how hard the easy is

# BookBeat ## A startup story

# Audio & e-books * Stream & Download * Monthly fee, unlimited use * Soft launched late 2015 * Real launch spring 2016

# Competitors * Audible * Storytel * Nextory * ...and many others

# The Big Picture * What should we do? * How should we do it? * Name, price, design, tonality * Partnerships, publishers, reporting?

# Tech * Backend * Integrations * Api(s) * Applications

# Process * Discovery & learning driven * Constant changes * Fine-tune, change, pivot * Adaptability is key

# Code * Adaptability over architecture * Build it right once we know * Avoid premature optimization * (Apps) Test most important parts only

# Keeping it together ## How to keep your code clean

# Good practices * Minimize coupling * Minimize inheritance * Don't let external dependencies leak * Keep it simple!

# Spike & Stabilize * Dan North, 2011 * Good for changing scope, pivots etc. * Optimize for throwawayability * Code should be easy to throw away

# Prototype-driven * Start with a prototype * Stabilize if proven valuable * Throw away if proven worthless * Code MUST be easy to throw away

# But what if you fail? ## How do you know?

# Code-smell

# Raise of hands ## Favorite code-smells?

# Duplicated code ## e.g. validation, formatting, business logic

# Long functions ## Hard to test, cyclomatic complexity

# Complicated code ## If your code needs a lot of comments, you know

# Large classes ## Does a lot of stuff...that it shouldn't

# Spaghetti code ## ...or lack of obvious design

# Hard coupling ## A depends on B which depends on...

# Bad habits ## Unit tests disabled, no version control etc.

# So, BookBeat? ## How did the MVP code look?

# Live Coding

# Wrapping up

# Thank you! Daniel Saidi · [@danielsaidi](https://twitter.com/danielsaidi)