Book Image

Kotlin Programming Cookbook

By : Aanand Shekhar Roy, Rashi Karanpuria
Book Image

Kotlin Programming Cookbook

By: Aanand Shekhar Roy, Rashi Karanpuria

Overview of this book

The Android team has announced first-class support for Kotlin 1.1. This acts as an added boost to the language and more and more developers are now looking at Kotlin for their application development. This recipe-based book will be your guide to learning the Kotlin programming language. The recipes in this book build from simple language concepts to more complex applications of the language. After the fundamentals of the language, you will learn how to apply the object-oriented programming features of Kotlin 1.1. Programming with Lambdas will show you how to use the functional power of Kotlin. This book has recipes that will get you started with Android programming with Kotlin 1.1, providing quick solutions to common problems encountered during Android app development. You will also be taken through recipes that will teach you microservice and concurrent programming with Kotlin. Going forward, you will learn to test and secure your applications with Kotlin. Finally, this book supplies recipes that will help you migrate your Java code to Kotlin and will help ensure that it's interoperable with Java.
Table of Contents (21 chapters)
Title Page
Copyright and Credits
Packt Upsell
Contributors
Preface
Index

How to skip the first "n" entries in Kotlin


In this recipe, we will learn how to drop entries in a collection. First, we will see how to drop the first n items, then we will see how to drop the last n items, and finally, we will see how to use a predicate while dropping the elements from the collection.

Getting ready

I'll be using IntelliJ IDEA for writing and running Kotlin code; you are free to use any IDE that can do the same task.

How to do it…

In the following steps, we will learn to skip the first n entries of a Kotlin list:

  1. First, let's see how to drop the first n items in a collection. We will be using a list, but it also works with an array. Also, we will be using kotlin.stdlib, which contains the functions required in this recipe. The function to use here is drop:
fun main(args: Array<String>) {
    val list= listOf<Int>(1,2,3,4,5,6,7,8,9)
    var droppedList=list.drop(2)
    droppedList.forEach {
        print(" ${it} ")
    }
}

//Output: 3 4 5 6 7 8 9
  1. To skip the last n...