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on December 24, 2024

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Kotlin Flow Control : When/Switch Expression

When Expression in kotlin programming is language replaces the switch conditional operator of C-like languages. Kotlin “when” operator matches the variable value with the branch conditions. If the condition of branch matches with the value then it will execute the statement of that branch. Example: fun main (args: Array<String>) { val x:Int = 1 when (x) { 1 -> print( "x = = 1" ) 2 -> print( "x = = 2" ) else -> { // Note the block print( "x is neither 1 nor 2" ) } } } Output: x = = 1 Kotlin compiler matches the value of "x" with the given branches. If the value is not matching any of the branches, then it will execute the "else" part. Here " else " works similar to " DEFAULT " operator of C-like languages. Kotlin provides multiple checks in the same line by providing “,” inside the checks. fun main (args: Array<String>...

How to declare variables in Kotlin

In Kotlin programming, you can declare variables using either var or val keywords. Var keyword is use to declare a variable and val declare a constant, can't be reassigned (they are called immutable). For example: val num = 11 ; println(num); val str = "Hello" ; println(str); If you'll try to reassign val For an example: val num = 11 ; Num = 12 ; It'll give you an error. Kotlin type inference: As you can see above examples, we didn't explicitly set type of the variables. The variables are getting their corresponding type, because of Kotlin Type Inference. Follow the following syntax, to explicitly set the variables type: val <variable name> : <variable type>=<value> Example: var num: Int = 42 ; val str: String = "Hello" ;

Kotlin Flow Control : If-Else Expression

If - Else Expression is a control flow mechanism available in the Kotlin Programming language. Similar to other functional language, 'if' is an expression, it is not a keyword in kotlin. The expression 'if' will return a value whenever necessary. Like other programming language, 'if-else' block is used as an initial conditional checking operator. Example: fun main (args: Array<String>) { val a:Int = 10 val b:Int = 5 var max: Int if (a > b) { max = a } else { max = b } print( "Max is :" +max) // As expression // val max = if (a > b) a else b } Output : Max is : 10 Note : You can replace entire If-Else block with val max = if (a > b) a else b.

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