Kotlin Blueprints

The when() expression

Typically, when replaces the switch case of traditional programming languages such as C, Java, and so on. A simple when block can look as follows:

    when (x) {      1 -> print("x == 1")      2 -> print("x == 2")      else -> {         // Note the block  print("x is neither 1 nor 2")        }     }

No verbosity and the simplest to understand isn't it! We have used the when block in the app at multiple places; in the chapter, we will quote one from the DelegatedPrefernce.kt file. The when()  function can be used as an expression or as a statement. The following is the code we have used in our app:

    val result: Any = when (defaultValue) {      is Boolean -> getBoolean(key, defaultValue)      is Int -> getInt(key, defaultValue)      is Long -> getLong(key, defaultValue ...