How to combine the output of multiple commands in fish?

Question

Say I want to send the output of to commands into another.

cat a.txt && ls

I can do this:

fish -c "cat a.txt && ls" | another_command

But it seems clunky, is there a way to do this without running a new instance?

Answer 1

use a begin...end block

begin; cat a.txt; ls; end | another_command

or with whitespace

begin
    cat a.txt
    ls
end | another_command