What's the usage of three dots (…) in dart List?

Question

I have my code written like this but it gives an error saying:

Error: A value of type \'List\' can\'t be assigned to a variable of type \'Widget\'.

Answer 1

Dart 2.3 introduce Spread operator (…)

Reference link : https://medium.com/flutter-community/whats-new-in-dart-2-3-1a7050e2408d

    var a = [0,1,2,3,4];
    var b = [6,7,8,9];
    var c = [...a,5,...b];

    print(c);  // prints: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]