kotlin-examples

A project that shows Kotlin language features that differ from java (https://kotlinlang.org/)

Table of contents:

Static Analysis QA Checks
Project structure
Building project
Libraries
Logging configuration
Code coverage
Kotlin features
Ideas to try

Checks

Jacoco/cobertura code coverage, pmd, checkstyle, enforcer, findbugs

Project structure

Each sub project follows the structure Maven project that consists of the following parts:

Kotlin main classes are under (src/main/kotlin) with different classes with kotlin features.
Test extensions for executing tests (src/test/kotlin) that show kotlin features and run during the build

Building project

mvn clean package

Pom.xml

Libraries:

kotlin

Logging

Standard output is used

Coverage

Coveralls and Cobertura are not good with generated code, so Delegates example with ObservableValue and VarArgExample were excluded from coverage.

Kotlin features

TopLevelFunction function as first class citizen
ExtSimpleService example of adding functionality (method) into existing class (problems can occur with separate compilation)
FactorialTailRec tail recursion example
NullableNonNullableReturnTypeExample example that shows nullable and notNullable types with ? in the end
WhenExample potentially more powerful instrument than java switch statement
Transaction kotlin data POJO example. data notation generates equals and hashcode, costructor generation, val - readonly properties, so only getters will be generated destructing and equality declaration example
Dollar shows
- Operator overrides.
- Operator overloading
- Equals and hashcode override_operators
- Try/catch expression values
- Copy value
- Referential and structural equals
- Destructuring object
- Inlining by locking example // coverage tool does not cover inline functions
- Infix function
- Null check do
- Closure
- Dollar Range implementation
DollarProgression progression implementation with internal visibility modifier to be visible inside module
VarArgExample shows vararg parameters example
Delegation example of Delegation pattern alternative to Inheritance
SealedExample feature of closing functionality inside sealed class. Not possible to extend class hierarchy from outside. Plus companion object example, cause there is no static members
variance examples of Producer/Consumer pattern to make safe casts and assignments
SpringExampleTest integration with spring framework
ObservableTest observable feature example (kind of value changed listener)
Mapping mapping from Map to class fields example
DeprecatedTest example of kotlin deprecation and tooling of Intellij idea for deprecation

Ideas

From reference https://kotlinlang.org/docs/reference/
Kotlin conf 2017 https://www.youtube.com/playlist?list=PLQ176FUIyIUY6UK1cgVsbdPYA3X5WLam5

License

Iurii-Dziuban/kotlin-examples

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