What does "..." in Dart mean?

Question

I saw this code, but found no explanation for what "..." means.

return ListView(
              children: <Widget>[
                if (bookCards != null) ...bookCards,
              ],
            );

This is actually probably a better dupe: https://stackoverflow.com/questions/57194452/meaning-of-triple-dots-in-flutter-syntax — Christopher Moore, Oct 07 '20 at 12:24

Maz341 · Answer 1 · 2020-10-08T06:25:35.060

2

It is called Spread Operator. It was included in dart from Dart 2.3.

How to use it? Consider the below as the basic example of how to use Spread Operator (...) in dart.

var var1 = [0,1,2,3,4];
var var2 = [6,7,8,9];
var var3 = [...var1,5,...var2];

print(var3);

It prints [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

edited Oct 08 '20 at 06:25

answered Oct 07 '20 at 12:18

Maz341

1 Answers1