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fun String.hasSpaces(): Boolean {
  val found = this.find { it == ' '}
  return found != null
}
// OR
fun String.hasSpaces() = find{ it == ' '} != null

// true
fun extensionsExample() { 
  "Does it have spaces?".hasSpaces()
}

// they are defined outside the class they extend (they don't have access to private variables)
class AquariumPlant(val color: String, private val size: Int)

fun AquariumPlant.isRed() = color == "Red"

//
fun GreanLeafyPlant.print() = println("GreenLeafyPlant")
fun AquariumPlant.print() = println("AquariumPlant")

fun staticExample() {
  val plant = GreenLeafyPlant(size = 50)
  plant.print() // GreenLeafyPlant

  val aquariumPlant: AquariumPlant = plant
  aquariumPlant.print() // AquariumPlant
}

// Extension properties
class AquariumPlant(val color: String, print val size: Int)

val AquariumPlant.isGreen: Boolean
  get() = color == "green"

// Property Example
fun propertyExample() {
  val plant = AquariumPlant("Green", 50)
  plant.isGreen // true
}