If you’re using Kotlin, you find yourself using the when expression all the time. Connect with us if you’re seeking to Hire Kotlin App Developers and switch to Kotlin when.

1. How to Replace Switch with When
in Kotlin?

2. As a beginner, you might look for how the Kotlin switch
statement works. If your background is working in C, Java, etc.
then switching to Kotlin works best. There is no switch statement
available in Kotlin; instead, it replaces the switch with the when
expression.
The switch is used as a two-state user interface element and
work as a toggle between ON and OFF like button. One can add a
switch into our application layout by using its switch object. By
default, the switch is off. Moving on with Kotlin, then When is
replace the Switch operator. A specific block of code needs to
execute when the condition fulfilled. One can take help from
Kotlin App Developers and develop android application.

3. In Kotlin switch case with string, when is mainly used in two
ways:
● When as a statement
● When as an expression
When’ is an expression compared with other branches. If it used
as a statement, the branch values compared sequentially with
the argument and execute the corresponding branch where the
condition matches. Here in this blog, we’ll look at how switch
replaces the when.
Let’s start with understanding Switch in Kotlin Android and then
we’ll check how the when keyword makes our code easier and
more understandable.

4. Switch
Suppose you have used a conditional statement where the
condition used in the conditional statement applies to a similar
type of data. Then instead of that use vast code for the
conditional statement. Use the switch to avoid using too many
conditional statements in our code. Let’s study with the help of
an example.
Let’s consider one example where we have to return emoji based
on input spring.

5. But if we rewrite the code using the When statement in Kotlin,
then it provides better readability than if/else. In the above code,
if/else statement replaced with the when statement.

7. Replace Switch Case Kotlin with When

8. Similar to if/else, the switch is one of the ancient ways to deal
with conditional execution. Whereas in Kotlin, we can replace
switch case and if/else with when similarly, we implement the
conditional execution. Now the switch can replace with the when
statement also to if/else. Make the code more readable,
consistent and adapt quickly with new developers.

9. Return values with When Block
Till now, you have seen the ability of when the block in Kotlin
switch case with spring replaces conditional statements. But well,
it can do more than this. Let’s say, it can return the values from
the conditional blocks after you execute the necessary steps.

10. Arbitrary Condition with When
We can also use more than one checks to execute a block when
the operator
There are several causes, but only one case that matches up will
work as a respective block of code that executed. The comma
added in the above example act as an OR operator.

11. Using When without an Argument
We’ve used ‘when’ with an argument. But when the real
potential of when is we use when without an argument.
Understand how it looks.
Later, it acts as an if/else block with class-level variable
conditions.

12. Now, Compare the instance with When
We can check whether the given operator is an instance of a
particular type at runtime by using the ‘is’ operator. The operator
‘is’ works similar to the instanceof operator in Java. Now use the
‘is’ and ‘!is’ operator inside when block. Get to know how Kotlin
switch case with string works with an example.

13. Main points about Kotlin when
Java uses Switch conditional statements that operated with
primitive data types, string class, and Kotlin switch enums.
instead, Kotlin allows when to be used with any user-defined
types. It makes it developer-friendly.
Unlike Java, Kotlin’s when can use with dynamic value like return
type of functions.
Also, check whether the given argument in collections uses the
‘in’ operator, which acts as contains.
The else is mandatory if you’re using when as an expression.

14. Example of a wide range of utility functions
In Kotlin, few simple utility functions are used for a simple task.
Let’s say if you want to get a minimum or maximum value in the
range. Similarly, the average value of the sum of range, total
count or value of the range, etc.
Check below Kotlin Functions
● count()
● average()
● min()
● max()
● sum()

15. Summary
In this blog, we have seen how powerful and useful the kotlin
when the expression is. If you’re using Kotlin, you find yourself
using the when expression all the time. Connect with us if you’re
seeking to Hire Kotlin App Developers and switch to Kotlin when.

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