Type 'String' is not a subtype of type 'List'

Question

I've got the following code which works well if there are tags present in the widget.tagname list.

List split = widget.tagname?.split(',')??'';

However, if there are no tags in the list I get this error;

type 'String' is not a subtype of type 'List'

What am I doing wrong?

user_3925977 · Answer

If tagname is null, then the compiler attempts to assign the value '' to a List, which is not possible. Replace '' with [] and you should be fine.

Type 'String' is not a subtype of type 'List<String>'

1 Answers