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LoginGeneral Tech Bugs & Fixes 2 years ago
Posted on 16 Aug 2022, this text provides information on Bugs & Fixes related to General Tech. Please note that while accuracy is prioritized, the data presented might not be entirely correct or up-to-date. This information is offered for general knowledge and informational purposes only, and should not be considered as a substitute for professional advice.
For me the revelation came when I realise that they all work the same way: by running something once, storing the value they get, and then cough up that same stored value when referenced through Dependency Injection.
Say we have:
app.factory('a', fn);
app.service('b', fn);
app.provider('c', fn);
The difference between the three is that:
a
's stored value comes from running fn
, in other words: fn()
b
’s stored value comes from new
ing fn
, in other words: new fn()
c
’s stored value comes from first getting an instance by new
ing fn
, and then running a $get
method of the instancewhich means, there’s something like a cache object inside angular, whose value of each injection is only assigned once, when they've been injected the first time, and where:
cache.a = fn()
cache.b = new fn()
cache.c = (new fn()).$get()
This is why we use this
in services, and define a this.$get
in providers.
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manpreet
Best Answer
2 years ago
As I understand it, when inside a factory I return an object that gets injected into a controller. When inside a service I am dealing with the object using
this
and not returning anything.I was under the assumption that a service was always a singleton, and that a new factory objectgets injected in every controller. However, as it turns out, a factory object is a singleton too?
Example code to demonstrate:
When changing
user.first
inACtrl
it turns out thatuser.first
inBCtrl
is also changed, e.g.User
is a singleton?My assumption was that a new instance was injected in a controller with a factory?