This Kotlin snippet showcases various ways to evaluate whether an integer is divisible by another integer using higher-order functions, member extension functions, and lambda references. It’s designed to illustrate Kotlin’s functional programming capabilities in a simple, clear manner.

gistfile1.txt

// A higher-order function that executes a lambda function `f` on `arg1` with `arg2` as an argument.
fun exec(
  arg1: Int, arg2: Int,
  f: Int.(Int) -> Boolean
) = arg1.f(arg2) // Calls the lambda `f` with `arg2`.

// A lambda that checks if an integer is divisible by another integer.
val isDivisibleLambda: Int.(Int) -> Boolean = { this % it == 0 }

// An extension function for Int that checks if it is divisible by a given integer.
fun Int.isDivisibleExtension(d: Int): Boolean {
  return this % d == 0
}

// A standard function that performs the divisibility check.
fun isDivisibleFunction(i: Int, d: Int): Boolean {
  return i % d == 0
}

fun main() {
  // Calls `exec` with an inline lambda function that checks divisibility.
  exec(10, 2, fun Int.(d: Int): Boolean {
    return this % d == 0
  }) eq true // Asserts the result is true. (Make sure to explain `eq`.)

  // Calls `exec` with the lambda `isDivisibleLambda`.
  exec(10, 2, isDivisibleLambda) eq true // Asserts the result is true.

  // Calls `exec` using the extension function `isDivisibleExtension`.
  exec(10, 2, Int::isDivisibleExtension) eq true // Asserts the result is true.

  // Calls `exec` using the top-level function `isDivisibleFunction`.
  exec(10, 2, ::isDivisibleFunction) eq true // Asserts the result is true.
}

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