Singleton Pattern or Rubbish?

[-Lost]

Somehow I got lost in an article that led me here:

http://www.javascriptkata.com/2007/0...e-a-singleton/

Having recently seen someone else mentioning a Singleton pattern in JavaScript, I wonder,
like the commenter Aaron, why anyone would use one?

For anyone who doesn't know what a Singleton pattern is, look here:

http://en.wikipedia.org/wiki/Singleton_pattern

"the singleton pattern is a design pattern that is used to restrict instantiation of a
class to one object"

Which basically means we end up with an object that has the ability to restrict itself to
only one instance at a time.

Anyway, I would appreciate any *clear* examples of how one might *require* a Singleton
pattern.

-Lost

[Douglas Crockford]

-Lost wrote:

Somehow I got lost in an article that led me here:

http://www.javascriptkata.com/2007/0...e-a-singleton/

Having recently seen someone else mentioning a Singleton pattern in JavaScript, I wonder,
like the commenter Aaron, why anyone would use one?

JavaScript can support much simpler formulations. For example:

var catNames = function () {
var names = [];
return {
add: function (catName) {
names.push(catName);
},
removeLast: function () {
return names.pop();
},
alertAllCats: function () {
alert(names.join(","));
}
};
}();

http://javascript.crockford.com/

[scripts.contact]

-Lost wrote:

Somehow I got lost in an article that led me here:

http://www.javascriptkata.com/2007/0...e-a-singleton/

Having recently seen someone else mentioning a Singleton pattern in JavaScript, I wonder,
like the commenter Aaron, why anyone would use one?

..........................

Anyway, I would appreciate any *clear* examples of how one might *require* a Singleton
pattern.

http://prototyp.ical.ly/index.php/20...the-singleton/