toString method
A string representation of this object.
Some classes have a default textual representation,
often paired with a static parse
function (like int.parse).
These classes will provide the textual representation as
their string representation.
Other classes have no meaningful textual representation
that a program will care about.
Such classes will typically override toString
to provide
useful information when inspecting the object,
mainly for debugging or logging.
Implementation
@override
String toString() {
return const <int, String>{
0: '.mp4',
1: '.mkv',
2: '.mov',
3: '.flv',
4: '.avi',
5: '.wmv',
6: '.gif',
}[index]!;
}