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Kotlin Quick Start Guide

You're reading from   Kotlin Quick Start Guide Core features to get you ready for developing applications

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Product type Paperback
Published in Aug 2018
Publisher Packt
ISBN-13 9781789344189
Length 178 pages
Edition 1st Edition
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Marko Devcic Marko Devcic
Author Profile Icon Marko Devcic
Marko Devcic
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Toc

Control flow


Kotlin has statements for determining what sections of the code will be executed next, during the runtime of a program. These statements are known as control flow statements. 

These statments are:

  1. If-else
  2. When
  3. Loops
  4. for loops
  5. while loops
  6. do-while loops

if-else

Kotlin’s if-else statements are expressions, not keywords. Which means they can have a value. Consider this example where an if-else expression is used to initialize a variable:

val str: String = if (num < 10) "Lower than 10" else "Equal or greater than 10"

When

Kotlin doesn’t have switch statements, like Java and other popular languages. Switch in other languages is a conditional operator which can be used for comparing multiple conditions on a variable.

In Kotlin this operator is called when and does the same job as a switch in other languages.

It checks the variable value against multiple conditions, and, if a condition is satisfied, it executes the expression for that branch. when is a lot more powerful than Java’s switch operator...

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