```class ResizableArray<K> { var array: ...

# getting-started

[katien]

class ResizableArray<K> {
    var array: Array<Any?> = arrayOfNulls(256)
    var size = 0

    fun add(value: K) {
        array[size] = value
        size++

        if (size == array.size)
            array = Array(array.size * 2, { if (it < size) array[it] else null })
    }

    operator fun get(index: Int): K {
        if (index < size)
            return array[index] as K
        else
            throw IndexOutOfBoundsException("The array is only $size long you can't access index $index")
    }

    operator fun set(index: Int, value: K) {
        if (index < size)
            array[index] = value
        else
            throw IndexOutOfBoundsException("The array is only $size long you can't access index $index")
    }
}