recursive_map

// you can write to stdout for debugging purposes, e.g.
// console.log('this is a debug message');

function solution(A) {
    // write your code in JavaScript (Node.js 6.4.0)
    //number of pairs 
    var pairs = 0;
    //TODO use recursion.
    //map through array
    A.map((item, pos, itemArray) => {
        //we the item the postion and array 
        //lets chek all values after this for similar
        itemArray.map((laterItem, laterPos, laterArray) => {
            //check that the item appeas after
            //check that the item is identical
            if(laterPos > pos && laterItem == item) {
                //if so lets increment the pairs
                pairs++;
            }
        })
    })
    
    //lets return the pairs 
    return pairs
}