var items = [ ['vara1', 100], ['vara2', 10]]
var total = 0

(function (items, mycallback) {
$.each(mycallback, function (cb) {
$.each(items, function(i, item) {
items[i] = cb.apply(this, [item]);
})
});
})([(function(items){
// sum items together
}), (function(items){
// display items
})]);