I'm trying to write some code in bash which uses introspection to select the appropriate function to call.

Determining the candidates requires knowing which functions are defined. It's easy to list defined variables in bash using only parameter expansion:

$ prefix_foo="one"
$ prefix_bar="two"
$ echo "${!prefix_*}"
prefix_bar prefix_foo

However, doing this for functions appears to require filtering the output of set -- a much more haphazard approach.

Is there a Right Way?