Unable to use string.contains() in kotlin `when` expression

Question

I am new to kotlin, I have tried several ways to use following code

val strAction = "Grid"  when(strAction){    strAction.contains("Grid")->println("position is 1")  } 

In above code strAction.contains("Grid") this line is showing me an error that Incompatible Type

Answer 1

You can also combine when and with to get a nice syntax:

with(strAction) {   when {     contains("Grid") -> println("position is 1")     contains("bar") -> println("foo")     startsWith("foo") -> println("bar")     else -> println("foobar")   } } 

You can also save the result of when into a property:

val result = with(strAction) {   when {     contains("bar") -> "foo"     startsWith("foo") -> "bar"     else -> "foobar"   } }  println(result) 

Answer 2

Try this remove when(strAction) parameter from when

val strAction = "Grid"      when {   strAction.contains("Grid") -> println("position is 1") }