best.js

function best(fun, coll) {
  return _.reduce(coll, function(x, y) {
    return fun(x, y) ? x : y 
  });
}

best(function(x,y) {
  return x > y
}, [1,2,3,4,5]);
// 5

best(function(x, y) {
  return x.age > y.age
}, [{name: 'Flavio', age: 37},{name:'Lenita', age:35}]);
// {name: 'Flavio', age: 37}