Programming in Kotlin: Fundamentals

Aug 9 2022 · Kotlin 1.6, Android 12, IntelliJ IDEA CE 2022.1.3

Part 3: Functions & Nullability

23. Return Data From Functions

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Previous episode: 22. Write Custom Functions Next episode: 24. Challenge: Work with Functions

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Sometimes, you might want a variable or constant to be a result of a computation. This computation might require different data and resources and doing this directly in a variable might not be possible. For this, you do this computation inside a function. But this time around a function that returns a value.

fun createRange(start: Int, end: Int): IntRange {
  return start..end
}

val closedRange = createRange(1, 10)

for (number in closedRange) print("$number \t")
println()

fun printRange(range: IntRange) {
  for (number in range) print("$number \t")
  println()
}

val closedRange = createRange(1, 10)
// New code below
printRange(closedRange)

fun createRange(start: Int, end: Int, isHalfOpen: Boolean = false): IntRange {
  if (isHalfOpen) {
    return start until end
  } else {
    return start..end
  }
}

fun createRange(start: Int, end: Int, isHalfOpen: Boolean = false): IntRange {
  return if (isHalfOpen) {
    start until end
  } else {
    start..end
  }
}

val halfOpenRange = createRange(5, 10, true)
printRange(halfOpenRange)

fun createRange(start: Int, end: Int, isHalfOpen: Boolean = false): IntRange = if (isHalfOpen) {
    start until end
  } else {
    start..end
  }

fun createRange(start: Int, end: Int, isHalfOpen: Boolean = false) = if (isHalfOpen) {
    start until end
  } else {
    start..end
  }

fun createRange(start: Char, end: Char, isHalfOpen: Boolean = false) = if (isHalfOpen) {
    start until end
  } else {
    start..end
  }

val charRange = createRange('A', 'Z')
printRange(charRange)

fun printRange(range: CharRange) {
  for (character in range) print("$character \t")
  println()
}