Strategy vs Pattern Matching (compare to: http://www.dofactory.com/javascript-strategy-pattern.aspx)

greeter.erl

-module(greeter).
-export([say_hi/1]).

say_hi({bored})    -> "Sup...";
say_hi({polite})   -> "Welcome sir.";
say_hi({friendly}) -> "Hey...".

% erl
% c(greeter).
% greeter:say_hi({polite}).

%=> "Welcome sir."

greeter.js

exports.bored = function () {
  this.sayHi = function () { return "Sup..." };
};

exports.polite = function () {
  this.sayHi = function () { return "Welcome sir." };
};

exports.friendly = function () {
  this.sayHi = function () { return "Hey..." };
};

module.exports = function (type) {
  return new exports[type];
};

// node
// var greeter = require('./greeter')('polite');
// greeter.sayHi();

//=> 'Welcome sir.'