Extension function kotlin

Kotlin extension function

fun Int.increment(): Int {
    return this+1
}
fun Boolean.invert(): Boolean {
    return xor(true) // a xor true = !a, by the conditional inversion property of xor.
}

Extension function kotlin

Kotlin provides the ability to extend a class with new functionality without 
having to inherit from the class or use design patterns such as Decorator. 
This is done via special declarations called extensions.

fun MutableList<Int>.swap(index1: Int, index2: Int) {
    val tmp = this[index1] // 'this' corresponds to the list
    this[index1] = this[index2]
    this[index2] = tmp
}

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