final Map<String, List<String>> todoDate = {
'today': ['code', 'read a book']};
I am trying to display the String value in the List.
Text(todoDate['today'][0], //ERROR!
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2 Answers
It is possible to get null data while reading map. And Text widget doesn't accept null value. You can provide default value on null cases.
Text(todoDate['today']?[0]??"default");
3 Comments
Md. Yeasin Sheikh
Glad to help, Also beware of using !, without checking null. else it will raise on issue on null cases. You can test changing
'today' with something else.
Ali Hazem
could you explain your code please? Thanks
Md. Yeasin Sheikh
Here if we encounter null value from
todoDate['today']?[0] using ?? will return right part default, Check this sectionJust use the null assertion operator ! to remove the null error.
It would be like this:
print(todoDate['today']![0]);
Just make sure the field exists otherwise you'd need to check if it's null first. And to check it you can use the null aware operator ? in conjunction with the null-coalescing operator ?? to default it to something else instead.
