Question 267682 in Flutter Question posted in
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Flutter – The element type 'Set<DetailsCard>' can't be assigned to the list type 'Widget'

Column(
          children: [
            Widget1(),
            Widget2(),
            Expanded(
              child: SingleChildScrollView(
                child: Container(
                  child: Column(
                    children: [
                              for(var i =0 ;i<categories.length;i++){
                                DetailsCard(catName: categories[i]);
                              }
                    ],
                  ),
                ),
              ),
            ),
          ],
        )

In the above code i want to add multiple widgets based on the items in the categories list . But when I try using the for loop i keep getting "The element type ‘Set’ can’t be assigned to the list type ‘Widget’." error.

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2

Answers


  1. 0

    use for statement inside of [...] like below:

    Column(
          children: [
            Widget1(),
            Widget2(),
            Expanded(
              child: SingleChildScrollView(
                child: Container(
                  child: Column(
                    children: [
                              for(var i =0 ;i<categories.length;i++)
                                DetailsCard(catName: categories[i])
                    ],
                  ),
                ),
              ),
            ),
          ],
        )

    do not add {} and ; in [...] statement, it is illegal

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  2. 0

    What I usually like to do with iterables is using .map() on Iterables (List, Sets). For example you could use:

    Column(
   children: categories.map((category) => Text(category)).toList(),
),

    If you have other Widgets in the Column other than the Widgets made from the iterables you could use the spread operator ....

    Column(
  children: [
     ...categories.map((category) => Text(category)),
     Text('This is a text'),
  ],
),
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