syntax:
when(variableName){
value1 -> { // statement 1 }
value2 -> { // statement 2 }
else -> { //statement 3}
}
when - It functions like a switch statement but just an upgrade version of switch. The variable is match to value1 first, if true, run the statement 1 but if false, check if value2 is match. If value2 is match, run the statement 2 but if false, run the else statement. But just like with if, if when is used in an expression, the last statement is the value.
syntax:
val name = when(variableName){
value1 -> {
// statement 1
// last statement 1
} value 2 -> {
// statement 2
// last statement 2
} else {
// statement 3
// last statement 3
}
}
Same process will be performed. If it match with one value1, the last statement 1 is the value. If none of the values match, then the last statement 3 is the value.
Note: If each one of the possible values is covered in the matches, then you can remove the else statement.
=================
fun main(){
println(playingWithWhen("6"))
}
fun playingWithWhen(x: Any): String{
return when(x){
1, 2 -> {"january to february"}
in 3..10 -> {"march to october"}
11 -> {"november"}
!is Int -> {"not an integer"}
else -> {"december"}
}
}
================
Result:
not an integer
Note:
1. "in" is an in-fix operator that is used in range(..) number
2. "is" is an in-fix operator that is used in checking the data type
3. you used a comma, if you have multiple values to group in one matching.
4. It is also possible that a when statement won't have a variable to compare to values. If this is the case, you can use a boolean expression in each value.
syntax:
when{
boolean expression 1 -> { // statement 1}
boolean expression 2 -> { //statement 2}
else -> { // statement 3}
}
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Kotlin Programming
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