$function func:length {text:"$(text)"}
# return length
function func:num_list with storage func:temp
# return num_list
function func:shuffle {list:"num_list"}
# return shuffle.result
function func:half {list:"shuffle.result"}
# return half.result

$function func:length {text:"$(text)"}
# return length
function func:text_list with storage func:temp
# return text_list

function func:join {list:"text_list"}
# return join.text

# tellraw @a {"storage":"func:temp","nbt":"join.text"}