Android Development with Kotlin

Non-local returns

Functions with function parameters might act similarly to native structures (such as loops). We've already seen the ifSupportsLolipop function and the repeatUntilError function. An even more common example is the forEach modifier. It is an alternative to the for control structure, and it calls a parameter function with each element one after another. This is how it could be implemented (there is a forEach modifier in the Kotlin standard library, but we will look at it later because it includes elements that have not yet been presented):

    fun forEach(list: List<Int>, body: (Int) -> Unit) { 
        for (i in list) body(i) 
    } 
 
    // Usage 
    val list = listOf(1, 2, 3, 4, 5) 
    forEach(list) { print(it) } // Prints: 12345 

The big problem is that ...