App.init_resource vs App.insert_resource

[HQ2000-Rust]

If I have a example struct Resource (with/without fields), does it make a difference if I add it as a Resource to my App using App.init_resource or App.insert_resource expect from the fact that the first one uses the default value and the other one a specific value?

[tim-blackbird]

The primary difference is that init_resource won't overwrite the resource if it was already inserted before. This way, you can ensure that a resource exists in one plugin, while still allowing some other plugin or user to insert a specific value. This is mostly useful for Bevy itself and third-party libraries.

[HQ2000-Rust]

Thanks for the quick answer!