command-pattern.js

var Executor = (function()
{
    var commands = {},
        executor = {
          handle: function(commandName, callback)
          {
            var commandHandler = {
                ref: this,
                callback: callback
            };
            commands[commandName] = commandHandler;
          }
    };
    
    executor.handle = function(commandName, callback)
    {
        var commandHandler = {
            ref: this,
            callback: callback
        };
        commands[commandName] = commandHandler;
    };
    
    executor.execute = function(commandName, data)
    {
        var cmd = commands[commandName];
        if (cmd)
        {
            cmd.callback.call(cmd.ref, data);
        }
    };
    
    return executor;
})();

(function(Executor, context)
{
    var showText = function(data)
    {
        console.log("Output text: " + data);
    };
    
    Executor.handle("consoleOut", showText);
    
})(Executor, this);

Executor.execute("consoleOut", "foobar");