So after fighting with zsh for a bit, it seems there is never, ever, a 0 element in zsh arrays. All arrays start populating at element 1 i.e $array[1]
Here is some example code to help ya populate and pilfer through an array of elements if its got at least one element:
# the following ssh command will return location of each loaded key. for this example, we only have one key loaded.
array_of_lines=("${(@f)$(ssh-add -L | awk -F " " '{print $3}')}")
# Adding an element
array_of_lines+=( this_is_weird )
# Listing out the elements
echo "0 - ${array_of_lines[0]}" ## should be empty
echo "1 - ${array_of_lines[1]}" ## will display our first element (in this case, we'll only have one)
echo "2 - ${array_of_lines[2]}" ## will be "this_is_weird"
if [ ${array_of_lines[1]} ]; then
for k in ${array_of_lines[@]}; do echo $k; done
else
echo "array is not populated"
fi
