Question 206035 in Flutter Question posted in
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How to return List not null in Flutter

I have a list like List<String?> list1 = ['a', 'b', null, 'c']

How do i get it List<String> list2 = ['a', 'b', 'c']

In Swift I can use compactMap and in Flutter is there any way like compactMap?

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4

Answers


  1. 0 
    List<String?> list1 = ['a', 'b', null, 'c']
list1.removeWhere((value) => value == null);

    or

    List<String?> list1  = ['a', 'b', null, 'c'];
List<String> list2  = list1.whereType<String>().toList();
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  2. 0

    You can try this short way:

    final List<String> list2 = list1.whereType<String>().toList();
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  3. 0

    Yes, there is an equivalent method in Flutter called whereType() which can be used to filter out null values from a list.

    List<String?> list1 = ['a', 'b', null, 'c'];
List<String> list2 = list1.whereType<String>().toList();
print(list2); // ['a', 'b', 'c']
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  4. 0

    You can try like :

    List<String> list2 = list1.nonNulls.toList();
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