Lists in Dart (Flutter)-CodePudding

So Im learning Dart right now, and I have a problem when it comes to declare lists. In a tutorial I saw that the teacher declared a list by using this syntax:

void main() {
final names = ['Foo', 'Bar', 'Baz'];
}

And in another turorial I saw this:

void main() {
List<String> names = ['Foo', 'Bar', 'Baz'];
}

I want to know if there is a differance between the two.

And thank you guys for reading my question

CodePudding user response：

final just means that once assigned it can't be reassigned. So you can't do

final names = ['Foo', 'Bar', 'Baz'];
names = ['Foo2', 'Bar2', 'Baz2'];

You could add it also to the other one as well like

final List<String> names = ['Foo', 'Bar', 'Baz'];

Without final it's fine to do

List<String> names = ['Foo', 'Bar', 'Baz'];
names = ['Foo2', 'Bar2', 'Baz2'];

Furthermore it's usually okay to leave out the type, because the compiler is smart enough to see that it is in fact a List<String> in this case. If you want to make a non-final variable without indicating the type you can use the keyword var, like

var names = ['Foo', 'Bar', 'Baz'];

So in these examples

var names = ['Foo', 'Bar', 'Baz'];
List<String> names = ['Foo', 'Bar', 'Baz'];

are identical, and

final names = ['Foo', 'Bar', 'Baz'];
final List<String> names = ['Foo', 'Bar', 'Baz'];

are identical.

CodePudding user response：

First one is the List which can be use as dynamic list or you can use as

List<dynamic> name= ['one,'two','three'];

Where as second one is used for specific String List OR

List<int> numbers= [1,2,3];