My intention is that i want say 5 instances of an class inside a list
final List<Ball> _ballList =[Ball(),Ball(),Ball(),Ball(),Ball(),]
instead of that I want something like
final List<Ball> _ballList =[Ball() * 5]
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2 Answers
Using generate() should help
For example,
class Ball{
String color;
}
void main() {
List<Ball> ballList = new List<Ball>.generate(5,(i)=>Ball());
for(int i=0;i<ballList.length;i++) {
print(ballList[i]);
}
}
Comments
With Dart 2.3 or later, you could use collection-for:
final List<Ball> _ballList = [
for (var i = 0; i < 5; i += 1) Ball(),
];
Note that the above will generate a List with 5 different instances of Ball, which I'm assuming is what you want. In languages (e.g. Python) that support constructs like your [Ball() * 5] example, you'd instead get a list that contains 5 elements of the same instance. If want the same instance instead, then you could use the List.filled constructor:
final List<Ball> _ballList = List<Ball>.filled(5, Ball());
