/*
* Yet another version of summing a list
* Another list summer. This time use an internal recursive function so 
* that you check base conditions before going into recursion.  
* This should, this be a little quicker than the previous version
 */

fun main() {
    println(bb(listOf(1,2,3,4,5,6)))
}
/*
* Another list summer. This time use an internal recursive function so 
* that you check base conditions before going into recursion.  
* This should, this be a little quicker than the previous version
* @param b3 -- a list of integers : default=null
* @param summ -- the number to consider to be the sum of an empty or null list: default 0
* @param pos -- the positionof the next item in the list to put into the
* sum : default=0
 */
fun bb(b3: List<Int>?=null, pos:Int=0, summ:Int=0) : Int {
    if (b3==null) return summ
    if (pos<0) return summ
    tailrec fun funcc (p4:Int , s4:Int) : Int {
        if (p4 >= b3.count()) return s4
        return funcc(p4+1, s4+b3.get(pos))
    }
    return funcc(pos, summ)
}