Bash loops work differently with arrays vs multiline strings >.<

bash_arrays_vs_multiline_strings.sh

#!/usr/bin/env bash

-----() { echo "----- $1 -----"; }


----- 'ARRAY' -----
ary=()
ary+=(abc)
ary+=("d e")
for val in "${ary[@]}"; do
  echo "val: $val"
done
# val: abc
# val: d e


----- 'Lines in `...`' -----
lines1=`ruby -e 'puts "ABC\nD E"'`
for val in "${lines1[@]}"; do
  echo "val: $val"
done
# val: ABC
# D E


----- 'Lines in $(...)' -----
lines2=$(ruby -e 'puts "ABC\nD E"')
for val in "${lines2[@]}"; do
  echo "val: $val"
done
# val: ABC
# D E


----- 'Lines in "$(...)"' -----
lines3="$(ruby -e 'puts "ABC\nD E"')"
for val in "${lines3[@]}"; do
  echo "val: $val"
done
# val: ABC
# D E