Observer Pattern (285 chars)

observer-pattern.js

//observer pattern - with comments
(function() {
    this.o_O = function(obj, eventList, i, item) {
        eventList = [];
            
        obj.subscribe = function(event,fn) {
            eventList.push(event, fn);
        }
        obj.unsubscribe = function(fn) {
            eventList.splice(eventList.indexOf(fn)-1, 2);
        }
        obj.unsubscribe_all = function(event) {
            for(i = 0; item = eventList[i]; i++){
                if (item == event) {
                    eventList.splice(i,2);   
                    i--;
                }
            }
        }
        obj.fire = function(event,a,b,c,d,e) {
            for (i in eventList) {
                if (eventList[i] == event) {
                    eventList[+i + 1](a, b, c, d, e);
                }
            }
        }
    }
})();


//observer pattern - obfuscated (285 chars)
!function(){this.o_O=function(a,b,c,d){b=[],a.subscribe=function(a,c){b.push(a,c)},a.unsubscribe=function(a){b.splice(b.indexOf(a)-1,2)},a.unsubscribe_all=function(a){for(c=0;d=b[c];c++)d==a&&(b.splice(c,2),c--)},a.fire=function(a,d,e,f,g,h){for(c in b)b[c]==a&&b[+c+1](d,e,f,g,h)}}}()


//observer pattern - usage
var observer = {}
o_O(observer); //make observer from from object

var mouse_up_handler = function(argument1) { 
    console.log("mouseUp subscription called, argument1 = " + argument1) 
};
var mouse_down_handler = function(argument1, argument2) { 
    console.log("mouseDown subscription called, argument1 = " + argument1 + ", argument2 = " + argument2) 
};

observer.subscribe("mouse_up", mouse_up_handler);
observer.subscribe("mouse_down", mouse_down_handler);

observer.fire("mouse_up");
observer.fire("mouse_up", 1);
observer.fire("mouse_down", 2, "someValue");

observer.unsubscribe(mouse_up_handler);
observer.unsubscribe_all("mouse_down");

observer.fire("mouse_up");
observer.fire("mouse_down");