I have the following example switch in java:
int variable = 2;
switch(variable){
case 1:
//cosas
break;
case 2:
case 3:
break;
case 4:
//cosas
break
default:
break;
}
What I want with this java code is to do it in kotlin, that is to say that when the variable is 2 or 3 it executes the same, just like I did in java.
Review the documentation , When , replaces the switch operator of type C languages, in this case Kotlin . Example:
when (x) {
1 -> print("x == 1")
2 -> print("x == 2")
else -> { // Note the block
print("x no es 1 o 2")
}
}
If many cases should be handled in the same way, the conditions can be combined with a comma:
when (x) {
0, 1 -> print("x == 0 or x == 1")
else -> print("de otra forma.")
}
We can use arbitrary expressions (not just constants) as branch conditions
when (x) {
parseInt(s) -> print("s codifica x")
else -> print("s no codifica a x")
}
We can also verify a value that can be in or ! in within a range or collection:
when (x) {
in 1..10 -> print("x is in the range")
in validNumbers -> print("x is valid")
!in 10..20 -> print("x is outside the range")
else -> print("none of the above")
}
Having defined the above, the version of your code in Kotlin would be :
var variable = 2
when (variable) {
1 -> {
//Agrega aquí lo que realizaría si variable es igual 1
}
2, 3 -> {
//Agrega aquí lo que realizaría si variable es igual a 2 o 3
}
4 -> {
//Agrega aquí lo que realizaría si variable es igual 4
}
else -> { // Opción default
}
}
In Kotlin the word 'when' is used
when (variable) {
1 -> break
2,3 -> break
4 -> break
else -> { break
}
}
In kotlin there is no control called switch but when :
when (x) {
1 -> print("x == 1")
2 -> print("x == 2")
else -> { // Note the block
print("x is neither 1 nor 2")
}
}
when also accepts expressions:
when(x)
{
is String -> { }
0, 1 -> // si es igual 0 o 1
else -> { }
}
You can use it in two ways:
1. When your cases only have one procedure.
var variable=2
when (variable) {
1 -> print("No Existe")
2 -> print("Existe")
3 -> print("No Existe")
4 -> print("No Existe")
else -> print("Error")
}
2. If your cases have more than one procedure.
var variable=2
when (variable) {
1 -> {
print("No Existe")
}
2 -> {
print("Existe")
}
3 -> {
print("No Existe")
}
4 -> {
print("No Existe")
}
else -> {
print("Error")
}
}
Note: If your cases have more procedures you should use {} if not nothing.