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----
-title: GNU bash
----
-(Associative) arrays
---------------------
-
-### Declaration
-
-`"${#xs[@]}"` doesn't work with `nounset` if `xs` wasn't defined, i.e. was
-declared with either of
-
-    local -a xs
-    declare -a xs
-    local -A xs
-    declare -A xs
-
-Therefore, if you want to extract the length of an array, append `=()` to the
-statements above.
-
-    local -a xs=()
-    declare -a xs=()
-    ...
-
-And now `"${#xs[@]}"` works with `nounset`.
-It doesn't affect expansion (see below) though.
-
-### Expansion
-
-#### Do
-
-    func ${arr[@]+"${arr[@]}"}
-
-#### Don't
-
-    func "${arr[@]}"                # Doesn't work with `nounset`.
-    func "${arr[@]+"${arr[@]}"}"    # Doesn't work properly with `declare -a arr=('')`.
-
-### `unset`
-
-#### Do
-
-    unset -v 'arr[x]'
-    unset -v 'arr[$i]'
-
-#### Don't
-
-    unset -v arr[x]         # May break due to globbing.
-    unset -v arr[$i]        # The same as above + a possible problem with quotation.
-    unset -v 'arr["x"]'     # Doesn't work for some reason.
-    unset -v 'arr["]"]'     # The same as above; just highlighting the problem with funny characters in array indices.
-    unset -v 'arr["$i"]'    # Also rejected.
-
-    # An insightful discussion on the topic: https://lists.gnu.org/archive/html/help-bash/2016-09/msg00020.html.
-
-`errexit`
----------
-
-### Do
-
-    bar_output="$( bar )"
-    foo "$bar_output"
-
-### Don't
-
-    foo "$( bar )"    # With `errexit`, foo will still get executed.
-                      # I don't know why.