Page 18 - Dart Language

Chapter 4: Collections

Examples

Creating a new List

Lists can be created in multiple ways.

The recommended way is to use a List literal:

var vegetables = ['broccoli', 'cabbage'];

The List constructor can be used as well:

var fruits = new List();

If you prefer stronger typing, you can also supply a type parameter in one of the following ways:

var fruits = <String>['apples', 'oranges'];
var fruits = new List<String>();

For creating a small growable list, either empty or containing some known initial values, the literal
form is preferred. There are specialized constructors for other kinds of lists:

var fixedLengthList1 = new List(8);
var fixedLengthList2 = new List.filled(8, "initial text");
var computedValues = new List.generate(8, (n) => "x" * n);
var fromIterable = new List<String>.from(computedValues.getRange(2, 5));

See also the Effective Dart style guide about collections.

Creating a new Set

Sets can be created via the constructor:

var ingredients = new Set();
ingredients.addAll(['gold', 'titanium', 'xenon']);

Creating a new Map

Maps can be created in multiple ways.

Using the constructor, you can create a new map as follow:

var searchTerms = new Map();

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