Kotlin if Expression

by Online Tutorials Library July 14, 2022

Kotlin if Expression

In Kotlin, if is an expression is which returns a value. It is used for control the flow of program structure. There is various type of if expression in Kotlin.

if-else expression
if-else if-else ladder expression
nested if expression

Traditional if Statement

Syntax of traditional if statement

Syntax of traditional if else statement

Kotlin if-else Expression

As if is an expression it is not used as standalone, it is used with if-else expression and the result of an if-else expression is assign into a variable.

Syntax of if-else expression

 val returnValue = if (condation) {      //code statement     } else {      // code statement     }     println(returnValue) 

Kotlin if-else Expression Example

Let’s see an example of if-else expression.

 fun main(args: Array<String>) {         val num1 = 10         val num2 =20         val result = if (num1 > num2) {             “$num1 is greater than $num2”         } else {             “$num1 is smaller than $num2”         }         println(result) } 

Output:

10 is smaller than 20

We can remove the curly braces of if-else body by writing if expression in only one statement.

For example:

 fun main(args: Array<String>) {         val num1 = 10         val num2 =20         val result = if (num1 > num2) “$num1 is greater than $num2” else “$num1 is smaller than $num2”         println(result) } 

Using if-else expression in one single line statement is like ternary operator in Java. Kotlin does not support any ternary operator.

Kotlin if-else if-else Ladder Expression

Let’s see an example of if-else if-else ladder expression.

 fun main(args: Array<String>) {     val num = 10     val result = if (num > 0){         “$num is positive”     }else if(num < 0){         “$num is negative”     }else{         “$num is zero”     }     println(result) } 

Output:

10 is positive

Kotlin Nested if Expression

Let’s see an example of nested if expression.

 fun main(args: Array<String>) {     val num1 = 25     val num2 = 20     val num3 = 30     val result = if (num1 > num2){          val max = if(num1 > num3){             num1         }else{             num3         }         “body of if “+max     }else if(num2 > num3){         “body of else if”+num2     }else{         “body of else “+num3     }     println(“$result”) } 

Output:

body of if 30

Next TopicKotlin when Expression

Kotlin if Expression

Kotlin if Expression

Traditional if Statement

Kotlin if-else Expression

Kotlin if-else if-else Ladder Expression

Kotlin Nested if Expression

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