Function which returns the objects ordered by age.

order_users_by_age.js

/**
 * Orders users by age
 * @param {Array} users - array of object where each one contains a name (a string) and age (a number)
 * @return {Array} sorted_array_of_users
 */
function order_by_age(users) {  
  var sorted_array_of_users = users.sort(compare("age", "ascending"));
  return sorted_array_of_users;
}

/**
 * Dynamic sort function that sorts objects by the given property name and the specified order
 * @param {string} property
 * @param {string} order - defualt is descending
 * @return {function} compareFunction 
 */
function compare(property, order) {
    var sortOrder = 1;
    if(order === "ascending") {
        sortOrder = -1;
    }
    return function (a,b) {
        var result = (a[property] < b[property]) ? -1 : (a[property] > b[property]) ? 1 : 0;
        return result * sortOrder;
    };
}