(bash) arrays are weird

bash-test.sh

@@ -1,19 +1,15 @@
 #!/usr/bin/env bash
 
-# NOTE: this is way simpler
-echo $(realpath "${BASH_SOURCE}")
+vector=({1..20})
 
-# NOTE: this is useless
-if [[ "${0}" == "${BASH_SOURCE}" ]]; then
-    root_dir="$(dirname "${0}")"
-    root_dir="$(realpath "${root_dir}")"
-else
-    root_dir="$(dirname "${0}")/$(dirname "${BASH_SOURCE}")"
-    root_dir="$(realpath "${root_dir}")"
+echo "before : ${vector[@]}"
+
+for n in ${!vector[@]}; do
+    echo $n
+    if (($n % 2 == 0)); then
+        unset vector[$n]
     fi
+done
 
-tput smso
-echo ${root_dir}
-tput rmso
-
-echo "blargh"
+echo "after : ${vector[@]}"
+echo "after_index : ${!vector[@]}"