not really. The difference is really about style. With a service, you get
an instance of it (as a singleton) as a factory, you get whatever the
function returns (as a singleton).
A singleton basically means that there will always only be one (every
accessor references the same instance)
So, to see how it would be the same look at this:
app.service('myThing', function MyThing() {
this.var = 123;
this.method = function() {}
});
vs
app.factory('myThing', function() {
function MyThing() {
this.var = 123;
this.method = function() {}
}
return new MyThing();
});
These do basically the same this. the service returns an instance of what
it is automatically, whereas you can return anything from the factory, i
just happen to be returning an instance of a similar class. (note i named
the function MyClass in the service, which isnt needed, but i did it just
to show the similarity)
Therefore, factories are more useful. Eg. If you wanted to return a type,
where you could instantiate many of them, you could do that too:
app.factory('MyThing', function() {
function MyThing() {
this.var = 123;
this.method = function() {}
}
return MyThing;
});
On 15 February 2015 at 07:33, Michael Costa <[email protected]> wrote:
> I've never quite understood the word 'singleton'..... ; My understanding
> is that using a "service" over a "factory" provides the benefit of loading
> data only once per page-refresh and shares it across the application,
> whereas the factory instantiates a fresh call to the data source every-time
> there is a $state change , new controller/scope instance, etc?
>
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Tony Polinelli
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