How to pass multiple function implementations in Kotlin?

Question

Reading about higher order functions in Kotlin, I see a syntax for passing a function implementation ("inline") like the following one:

calculate(4, 5) { a, b -> a * b }

The a, b -> a * b part is actually a function passed to a function. Full snippet:

fun calculate(x: Int, y: Int, operation: (Int, Int) -> Int): Int {  // 1
    return operation(x, y)                                          // 2
}

fun sum(x: Int, y: Int) = x + y                                     // 3

fun main() {
    val sumResult = calculate(4, 5, ::sum)                          // 4
    val mulResult = calculate(4, 5) { a, b -> a * b }               // 5
    println("sumResult $sumResult, mulResult $mulResult")
}

Consider having a function that receives 2 functions, e.g.

fun calculate2(x: Int, y: Int, operation: (Int, Int) -> Int, operation2: (Int, Int) -> Int): Int {
    //...
}

How do I pass it 2 function implementations - "inline" (without first declaring the functions)?

Trying to do like the following gives me a compilation error:

calculate(4, 5) { a, b -> a * b} {a, b -> a + b }

Screencap:

plplmax · Accepted Answer · 2022-05-21 04:48:07Z

3

calculate(4, 5, { a, b -> a * b }, { a, b -> a + b })

or

calculate(4, 5, { a, b -> a * b }) { a, b -> a + b }

answered May 21, 2022 at 4:48

plplmax

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