higher-order functions

HigherOrder.kt

fun main(args: Array<String>) {
    println(sum(1, 3))       // 4
    println(sum2(1, 3))      // 4
    println(multiply(1, 3))  // 3
    println(subtract(1, 3))  // -2
}

fun sum(a: Int, b: Int)
        = higherOrderFunction(a, b, { a, b -> a + b })

fun sum2(a: Int, b: Int)
        = higherOrderFunction(a, b) { a, b -> a + b }

fun multiply(a: Int, b: Int)
        = higherOrderFunction(a, b, { a, b -> a * b })

fun subtract(a: Int, b: Int)
        = higherOrderFunction(a, b, { a, b -> a - b })


fun higherOrderFunction(a: Int, b: Int, block: (Int, Int) -> Int): Int {
    return block(a, b)
}