Joining 'fish shell' arguments into a single string with spaces

Sorry, this question is already answered for 'bash' here: Joining bash arguments into single string with spaces . in Fish, using

"'$*'"

leads to this error:

$* is not supported. In fish, please use $argv.

but I can't figure out how to join $argv elements to a single string with space between them. I also tried the

"${@}"

solution, which also doesn't work.