shell - Fish equivalent of bash $(command) notation

Question

I am currently trying out the fish shell instead of using bash. One type of notation I'm having trouble learning the fish-equivalent notation for is $(command), similar to how it is described in this SOF post. How do I write this using fish? Keep in mind that I could use backslash characters around the command I want to evaluate, but the linked post and other posts discourage this because it is an old style of evaluating commands.

Specifically, this is the bash command I want to convert to fish syntax (for initializing rbenv during startup of the shell):

eval "$(rbenv init -)"

question from:https://stackoverflow.com/questions/19211855/fish-equivalent-of-bash-command-notation

Answer 1

In fish, $ is used only for variables. Correct notation equivalent to bash $(command) is just (command) in fish.