Effective Kotlin: Item 29 — Favor generic types

As with Java, there is no excuse in forcing clients to cast types when using your code especially when making a class generic is often trivial. Item 29 of Joshua Bloch’s brilliant Effective Java covers this by showing an example of generifying a Stack class which might look as follows in Kotlin:

class Stack(initialCapacity: Int = 16) {
    private var elements = arrayOfNulls<Any?>(initialCapacity)
    private var size = 0

    val isEmpty = size == 0

    fun push(e: Any) {
        ensureCapacity()
        elements[size++] = e
    }

    fun pop()…