Kotlin when expression In Kotlin, when replaces the switch operator of other languages like Java. A certain block of code needs to be executed when some condition is fulfilled. The argument of when expression compares with all the branches one by one until some match is found. After the first match found, it reaches to end of the when block and execute the code next to when block. Unlike switch case in java or any other programming language, we do not require break statement at the end of each case. In Kotlin, when can be used in two ways: when as a statement when as an expression Using when as a statement with else – when can be used as a statement with or without else branch. If it is used as a statement, the values of all individual branches are compared sequentially with the argument and execute the corresponding branch where condition matches. If none of the branches satisfied with the condition then it will execute the else branch. Kotlin when Expression In this tutorial, you will learn about when construct in Kotlin with the help of various examples. Kotlin when Construct The when construct in Kotlin can be thought of as a replacement for Java switch Statement. It evaluates a section of code among many alternatives. The program above takes an input string from the user (Recommended Reading: Get String Input from the User in Kotlin). Suppose, the user entered *. In this case, the expression a * b is evaluated, and the value is assigned to variable result. If none of the branch conditions are satisfied (user entered anything except +, -, *, or /) , else branch is evaluated. Guide to the “when{}” Block in Kotlin 1. Introduction This tutorial introduces the when{} block in Kotlin language and demonstrates the various ways that it can be used. To understand the material in this article, basic knowledge of the Kotlin language is needed. You can have a look at the introduction to the Kotlin Language article on Baeldung to learn more about the language. 2. Kotlin’s when{} Block When{} block is essentially an advanced form of the switch-case statement known from Java. In Kotlin, if a matching case is found then only the code in the respective case block is executed and execution continues with the next statement after the when block. This essentially means that no break statements are needed at the end of each case block. To demonstrate the usage of when{}, let’s define an enum class that holds the first letter in the permissions field for some of the file types in Unix: Using when expression is far easy and more clean in comparison to writing many if...else if expressions.Kotlin when expression is similar to the switch statement in C, C++ and Java. Kotlin when expression Kotlin when expression tutorial shows how to use when expressions in Kotlin. A when expression is a replacement of a switch statement known from C family of languages. Kotlin is a statically-typed programming language that runs on the Java virtual machine. Kotlin when matches its argument against all branches sequentially until some branch condition is satisfied. It can be used either as an expression or as a statement. If it is used as an expression, the value of the satisfied branch becomes the value of the overall expression. Follow my Facebook Page : https://www.facebook.com/105940115222549 Follow me on Instagram : https://www.instagram.com/p/CViUlw2sOMi Follow me on tumblr : http://programming-guru.tumblr.com Follow me on reddit : https://www.reddit.com/u/Programming_guru1?utm_medium=android_app&utm_source=share Kotlin when expression evaluates a section of code among many alternatives as explained in below example. Kotlin when matches its argument against all branches sequentially until some branch condition is satisfied. Kotlin WHEN as Expression | Kotlin When Statement & Expression | WHEN EXPRESSION KOTLIN ANDROID Kotlin WHEN as Expression | Kotlin When Statement & Expression | WHEN EXPRESSION KOTLIN ANDROID Kotlin WHEN as Expression | Kotlin When Statement & Expression | WHEN EXPRESSION KOTLIN ANDROID Programming Guru,Guru Programming,programming,gurru,programminggurru,when,when as expression,kotlin when example,kotlin when ignore case,kotlin when multiple values,kotlin when without else,kotlin when enum,kotlin when break,how kotlin when works,how to use when in kotlin,kotlin when tutorial,kotlin when as an expression,what is when in kotlin,Kotlin WHEN as Expression,Kotlin When Statement & Expression,kotlin when ... https://www.youtube.com/watch?v=faRk35qXCQk