This month for our we picked three popular libraries that are helpful for adding functional types to projects, working with various time values, and validating text input fields.

Kategory

Kategory is a library for typed functional programming in Kotlin. It includes the most popular types, type classes, and abstractions, such as Option, Try, Either, IO, Functor, Applicative, and Monad.

When to use:

When you need to use a lot of functional types in your .

Time

Time library GitHub

The Time library is for you if you’ve ever written something like val duration = 10 * 1000 to represent a duration of 10 seconds (in milliseconds), because most methods in Kotlin/Java take duration parameters in milliseconds. It means that Time provides type-safe time calculations in Kotlin, powered by generics.

When to use:

When you’re working with time values.

RxValidationTextInputLayout

RxValidationTextinputLayout library mentioned in GitHub digest by Yalantis

This library is the easiest way to bring validation to EditText with TextInputLayout. This solution brings a flexible API and a reactive approach to user input handling.

When to use:

When you need to validate text input fields.

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