Book Image

Kotlin Standard Library Cookbook

By : Samuel Urbanowicz
Book Image

Kotlin Standard Library Cookbook

By: Samuel Urbanowicz

Overview of this book

For developers who prefer a more simplistic approach to coding, Kotlin has emerged as a valuable solution for effective software development. The Kotlin standard library provides vital tools that make day-to-day Kotlin programming easier. This library features core attributes of the language, such as algorithmic problems, design patterns, data processing, and working with files and data streams. With a recipe-based approach, this book features coding solutions that you can readily execute. Through the book, you’ll encounter a variety of interesting topics related to data processing, I/O operations, and collections transformation. You’ll get started by exploring the most effective design patterns in Kotlin and understand how coroutines add new features to JavaScript. As you progress, you'll learn how to implement clean, reusable functions and scalable interfaces containing default implementations. Toward the concluding chapters, you’ll discover recipes on functional programming concepts, such as lambdas, monads, functors, and Kotlin scoping functions, which will help you tackle a range of real-life coding problems. By the end of this book, you'll be equipped with the expertise you need to address a range of challenges that Kotlin developers face by implementing easy-to-follow solutions.
Table of Contents (11 chapters)

Adding custom names for imports

In this recipe, we are going to explore how to add custom names to the import declarations. We are going to import the java.lang.StringBuilder class, add a custom name to it and make use of it in the sample code to demonstrate it in action.

How to do it...

  1. Import the StringBuilder class with a custom alias:
import java.lang.StringBuilder as builder
  1. Use the custom StringBuilder name in the sample code:
import java.lang.StringBuilder as builder

fun main(vararg args: String) {
val text = builder()
.append("Code is like humor. ")
.append("When you have to explain it, ")
.append("it’s bad.")
.toString()
...