How can I get unique values from an array in Bash?

Question

I\'ve got almost the same question as here.

I have an array which contains aa ab aa ac aa ad, etc. Now I want to select all unique elements from this ar

Answer 1

Without loosing the original ordering:

uniques=($(tr ' ' '\n' <<<"${original[@]}" | awk '!u[$0]++' | tr '\n' ' '))