[1.12.2] Get ID of World object

[Durtle02]

If I have a variable of type World.class how would I get the ID of it? As far as I understand the dimension ID is not stored in the world object. 
What I need to check is if the dimension is the overworld or a custom dimension I have created.
For example if I was to use onBlockActivated how would I get the ID of the world passed though as a parameter?

[Durtle02]

Thanks for the quick response! I'm not too familiar with lambda expressions and I like to know what I'm doing with my code. I've read though a few explanations and from what I can tell this is a Comparator Lambda, however, I still don't understand how it's used as I've never worked with them. If it's not too much ask, could you give an explanation and or usage example?

[Durtle02]

Alright my bad, thanks for the help. I just didn't know what you meant by :: . Last question, would world.provider.getDimension() work in theory?

Edited April 23, 2018 by Durtle02

[Draco18s]

world is an instance of World so...

1 hour ago, diesieben07 said:

provider is a non-static field in World

Yes.