Separating list of file and directory names

Can one simplify or make clearer the following loop. I loop through a sequence of file names and directories stored in parg, separating the valid names from the invalid ones. I also remove duplicates. fdir contains the valid entries, whereas fda and dra contain the valid files and valid directories respectively.

declare -A tag       # Prescribe an Associative Array
for fda in "${parg[@]}"; do
  [[ -f "$fda" ]] || [[ -d "$fda" ]] || continue  # Invalid Entry
  [[ ${tag[comint:${fda}]+E} ]] && continue       # Existing Entry
  tag[comint:${fda}]=1
  fdir+=( "$fda" )
  [[ -f "$fda" ]] && fla+=( "$fda" )
  [[ -d "$fda" ]] && dra+=( "$fda" )
done

Rephrasing your question:

I have filenames and directory names (some of which are duplicates and some others are nonexistent) stored as elements in an array(original) ... In bash, how can I test and process the elements in the original array into a new array refined excluding duplicate and nonexistent filenames/directory names ... And at the same time creating two new arrays files(containing only refined filenames) and directories(containing only refined directory names)?

Issue reproduction:

# Create some test files
$ touch file{1..3}

# Create some test directories
$ mkdir dir{1..3}

# List current working directory contents
$ printf '%s\n' *
dir1
dir2
dir3
file1
file2
file3

# Add contents to an array
$ for i in *
  do
  original+=( "$i" )
  done

# Add contents to the same array again to generate duplicates
$ for i in *
  do
  original+=( "$i" )
  done

# Add some invalid entries
$ original+=( "file4" "dir4" "file5" "dir5" )

# Print the array
$ printf '%s\n' "${original[@]}"
dir1
dir2
dir3
file1
file2
file3
dir1
dir2
dir3
file1
file2
file3
file4
dir4
file5
dir5

Possible solution:

# Test, refine and classify array items
$ for i in "${original[@]}"
  do
  if [[ ! "${refined[*]}" =~ "$i" ]]
    then
    [ -f "$i" ] && refined+=( "$i" ) && files+=( "$i" )
    [ -d "$i" ] && refined+=( "$i" ) && directories+=( "$i" )
    fi
  done

# Print the "refined" array
$ printf '%s\n' "${refined[@]}"
dir1
dir2
dir3
file1
file2
file3

# Print the "files" array
$ printf '%s\n' "${files[@]}"
file1
file2
file3

# Print the "directories" array
$ printf '%s\n' "${directories[@]}"
dir1
dir2
dir3