The bang (!) operator in elm [duplicate]

Question

What does the bang (or exclamation mark) operator do in elm? I saw an application with an init like this:

init = emptyModel ! []

I've tried looking in the elm docs, but either there is no info or I couldn't find it:)

Answer 1

The definition of the ! operator is here.

It takes a model, a list of commands and returns a tuple (pair) with a model and a single command which is the batch of all the commands