E> constructor Null safety
- [int? length]
Creates a list of the given length.
This constructor will throw an exception if
E is not a nullable type.
In this case, another constructor such as List.filled must be used
The created list is fixed-length if
length is provided.
List fixedLengthList = new List(3); fixedLengthList.length; // 3 fixedLengthList.length = 1; // Error
The list has length 0 and is growable if
length is omitted.
List growableList = ; growableList.length; // 0; growableList.length = 3;
To create a growable list with a given length, for a nullable element type, just assign the length right after creation:
List growableList = ..length = 500;
For a non-nullable element type, an alternative is the following:
List<int> growableList = List<int>.filled(500, 0, growable: true);
length must not be negative or null, if it is provided.
If the element type is not nullable,
length must not be greater than
This constructor cannot be used in null-safe code.
Use List.filled to create a non-empty list.
This requires a fill value to initialize the list elements with.
To create an empty list, use
 for a growable list or
List.empty for a fixed length list (or where growability is determined
external factory List([int? length]);