About the Book
Kotlin is a powerful and pragmatic language, but it's not enough to know about its features. We also need to know when they should be used and in what way. This book is a guide for Kotlin developers on how to become excellent Kotlin developers. It presents and explains in-depth the best practices for Kotlin development. Each item is presented as a clear rule of thumb, supported by detailed explanations and practical examples.
If you are interested in paperback, you can purchase it here.
Well done! I've read a few items and I have to admit that I learned some interesting stuff. Great book :)
Really love this book! ?
Some time ago I started reading @EffectiveKotlin by @marcinmoskala, it's a must-read for every developer writing Kotlin. Even if you don't agree with all the items, for sure it will make you think twice about what you're coding.
Thanks for writing Effective Kotlin, I'm liking the tips from the book so far.
I really enjoyed your Effective Kotlin book and intend to use it for an "Advanced Kotlin" workshop series I'm planning at work
- Introduction: Be pragmatic
- Part 1: Good code
Chapter 1: Safety
- Item 1: Limit mutability
- Item 2: Eliminate critical sections
- Item 3: Eliminate platform types as soon as possible
- Item 4: Minimize the scope of variables
- Item 5: Specify your expectations for arguments and state
- Item 6: Prefer standard errors to custom ones
Item 7: Prefer a nullable or
Resultresult type when the lack of a result is possible
Item 8: Close resources with
- Item 9: Write unit tests
Chapter 2: Readability
- Item 10: Design for readability
- Item 11: An operator’s meaning should be consistent with its function name
- Item 12: Use operators to increase readability
- Item 13: Consider making types explicit
- Item 14: Consider referencing receivers explicitly
- Item 15: Properties should represent a state, not a behavior
Item 16: Avoid returning or operating on
- Item 17: Consider naming arguments
- Item 18: Respect coding conventions
- Part 2: Code design
Chapter 3: Reusability
- Item 19: Do not repeat knowledge
- Item 20: Do not repeat common algorithms
- Item 21: Use generics when implementing common algorithms
- Item 22: Avoid shadowing type parameters
- Item 23: Consider using variance modifiers for generic types
- Item 24: Reuse between different platforms by extracting common modules
Chapter 4: Abstraction design
- Item 25: Each function should be written in terms of a single level of abstraction
- Item 26: Use abstraction to protect code against changes
- Item 27: Specify API stability
- Item 28: Consider wrapping external APIs
- Item 29: Minimize elements’ visibility
- Item 30: Define contracts with documentation
- Item 31: Respect abstraction contracts
Chapter 5: Object creation
- Item 32: Consider factory functions instead of secondary constructors
- Item 33: Consider a primary constructor with named optional arguments
- Item 34: Consider defining a DSL for complex object creation
- Item 35: Consider using dependency injection
Chapter 6: Class design
- Item 36: Prefer composition over inheritance
- Item 37: Use the data modifier to represent a bundle of data
- Item 38: Use function types or functional interfaces to pass operations and actions
- Item 39: Use sealed classes and interfaces to express restricted hierarchies
- Item 40: Prefer class hierarchies instead of tagged classes
- Item 41: Use enum to represent a list of values
Item 42: Respect the contract of
Item 43: Respect the contract of
Item 44: Respect the contract of
- Item 45: Consider extracting non-essential parts of your API into extensions
- Item 46: Avoid member extensions
- Part 3: Efficiency
Chapter 7: Make it cheap
- Item 47: Avoid unnecessary object creation
- Item 48: Consider using object declarations
- Item 49: Use caching when possible
- Item 50: Extract objects that can be reused
- Item 51: Use the inline modifier for functions with parameters of functional types
- Item 52: Consider using inline value classes
- Item 53: Eliminate obsolete object references
Chapter 8: Efficient collection processing
- Item 54: Prefer Sequences for big collections with more than one processing step
- Item 55: Consider associating elements to a map
- Item 56: Consider using groupingBy instead of groupBy
- Item 57: Limit the number of operations
- Item 58: Consider Arrays with primitives for performance-critical processing
- Item 59: Consider using mutable collections
- Item 60: Use appropriate collection types
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