kotlin-functional
Purpose
This library provides a set of concepts and implementations of patterns commonly used in functional programming.
Background
With the increasing of the multi-threaded/core capabilities on the devices, it is not feasible to continue using stateful, assumption-based and side-effect styles of programming.
Kotlin provides a very limited range of functional structures and patterns.
What to use it for
This library is an attempt to complement the existing features of kotlin, as well as providing new types that are useful in functional programming.
Common Data Types
Optional
Encapsulates a value that may or may not be present. It abstracts the nullability of a value.
Most commonly used with the RxJava framework, where nulls are forbidden.
Either
A data structure that can only carry one of two possibilities.
Most commonly used to represent Correct (Right) or Error (Left) result of one computation.
NonEmpty List
A list that must have at least one element.
As a result, multiple operations are guaranteed to yield more predictable results,
such as first() or last().
Most commonly used to represent Lists that have been tested for emptiness.
Validation
Akin to Either, Validation can only carry a Success or a Failure result. While Either is used to shortcut errors, Validation is used to accumulate them.
Most commonly used to accumulate/compose errors from multiple computations.
Other uses
You will find in this library other concepts such as Monad, Monoid and Foldable.
Dependency
Gradle
repositories {
maven { url 'https://jitpack.io' }
}
dependencies {
implementation "com.github.fsbarata.kotlin-functional:base:$kfVersion"
}