_.mapFirst.js

/**
 * Try properties against object and map first value with callback.
 *
 * @param {array} properties
 * @param {object} obj
 * @param {function} callback
 *
 * @return {string|boolean}
 */
_.mapFirst = function (properties, obj, callback) {
  var prop = _.first(_.intersection(properties, _.keys(obj)));
  return (prop in obj) ? callback(obj[prop]) : false;
};


/**
 * Example...
 */
console.log(_.mapFirst(['first', 'username'], {id: 555, first: 'Bob', username: 'bob123'}, function (value) {
  return 'Hello ' + value + '!';
});
//=> Hello Bob!