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Hands-On Design Patterns with Kotlin

You're reading from   Hands-On Design Patterns with Kotlin Build scalable applications using traditional, reactive, and concurrent design patterns in Kotlin

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Product type Paperback
Published in Jun 2018
Publisher Packt
ISBN-13 9781788998017
Length 310 pages
Edition 1st Edition
Languages
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Author (1):
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Alexey Soshin Alexey Soshin
Author Profile Icon Alexey Soshin
Alexey Soshin
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Table of Contents (13) Chapters Close

Preface 1. Getting Started with Kotlin FREE CHAPTER 2. Working with Creational Patterns 3. Understanding Structural Patterns 4. Getting Familiar with Behavioral Patterns 5. Functional Programming 6. Streaming Your Data 7. Staying Reactive 8. Threads and Coroutines 9. Designed for Concurrency 10. Idioms and Anti-Patterns 11. Reactive Microservices with Kotlin 12. Other Books You May Enjoy

Drop family

OK, this is cool if you have to iterate over all elements in your collection anyway. But with the for loops in Java, you could do something like this:

// Skips first two elements
for (int i = 2; i < list.size(); i++) {
// Do something here
}

How are you going to achieve that with your funky functions, huh?

Well, for that there's drop():

val numbers = (1..5).toList()
println(numbers.drop(2)) // [3, 4, 5]

Do note that this doesn't modify the original collection in any way:

println(numbers) // [1, 2, 3, 4, 5]

If you would like to stop your loop earlier, there's dropLast() for that:

println(numbers.dropLast(2)) // [1, 2, 3]

Another interesting function is dropWhile(), in which it receives a predicate instead of a number. It skips until the predicate returns true for the first time:

val readings = listOf(-7, -2, -1, -1, 0, 1, 3, 4)

println(readings.dropWhile...
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