Lambdas and Higher-Order Functions

Function Types

Name the input and output types of a function parameter.

Function Types

FunctionTypes.kt 
fun combine(left: Int, right: Int, operation: (Int, Int) -> Int): Int {
    val combined = operation(left, right)
    return combined
}

fun main() {
    val left = 
    val right = 2
    val sum = combine(left, right, { a, b ->
        a + b
    })

    println("left=$left")
    println("sum=$sum")
}

fun combine(left: Int, right: Int, operation: (Int, Int) -> Int): Int {
    val combined = operation(left, right)
    return combined
}

fun main() {
    val left = 
    val right = 2
    val sum = combine(left, right, { a, b ->
        a + b
    })

    println("left=$left")
    println("sum=$sum")
}

fun combine(left: Int, right: Int, operation: (Int, Int) -> Int): Int {
    val combined = operation(left, right)
    return combined
}

fun main() {
    val left = 
    val right = 2
    val sum = combine(left, right, { a, b ->
        a + b
    })

    println("left=$left")
    println("sum=$sum")
}
function-type `(Int, Int) -> Int` means a function receives two integers and returns an integer.