maximum contiguous sum

maxContig

function add (collection){
  var sum = 0;
  collection.forEach(function(number) {
    sum += number;
  });
  return sum;
}

function maxContig (collection){
  var sum = 0;
  var index;

  for (var i = 0; i < collection.length; i++){
    for (var j = 0; j < collection.length; j++) {
      var rangeSum = add(collection.slice(i,j));
      if (rangeSum > sum) {
        sum = rangeSum;
        index = [i,j];
      }
    }

  }
  return collection.slice(index[0],index[1]);
}