lambda function learning

lambdafile.kt

fun main(){
    var fn: (a: Int, b: Int) -> Int = ::sum
    var lambdaOne: (Int,Int)->Int = {x: Int, y: Int -> x+y }

    multiLineLambda()
    val singleParameter: (Int) -> (Int) = {x: Int -> x * x}
    val simplifySingleParameter: (Int) -> (Int) = {it * it}

    calculator(1, 2){a,b -> a +b} //if lambda expression is the last parameter of a function
    //you can write that lamdba in above way also.

}

val multiLineLambda: () -> Int = {
    println("Hello lambda")
    val a: Int = 2 + 3
    "Hello lambda code"
    a//last statement is automatically the return statement in lambda.
}

fun sum(a: Int, b: Int) : Int = a + b

fun calculator( a: Int, b: Int, op: (Int, Int) -> Int): Int  {
    return op(a,b)
}