:sig
StringList StringList::keys() const

:params
return value : index keys as strings

:content
Returns the list indexes as strings from `0` through `size() - 1`. Use it when code expects string keys for a list-shaped value.

:example
StringList items = split("red,green,blue", ",");
print(join(items.keys(), ","), "\n");

:see
>types
0_StringList
2_StringList_each
2_StringList_map