unset Array                               # erase any notion of variable array.
declare -A Array                          # make it associative

Array=([foo]=one [bar]=two [baz]=three)   # give it values.

printf '<%s> ' "${Array[@]}" # <two> <three> <one>  # List of values.

$ printf '<%s> ' "${!Array[@]}" # <bar> <baz> <foo> # List of keys

$ printf '<%s> ' "${Array[*]}" # <two three one> # One string of list of values.

$ printf '<%s> ' "${!Array[*]}" # <bar baz foo> # One string of list of keys.