Dart Programming - Lists

A very commonly used collection in programming is an array. Dart represents arrays in the form of List objects. A List is simply an ordered group of objects. The dart:core library provides the List class that enables creation and manipulation of lists

Lists can be of 

• Fixed Length List
• Growable List

Fixed Length List

A fixed length list’s length cannot change at runtime

 Declaring a list

Syntax

var list_name = new List(initial_size)

The above syntax creates a list of the specified size. The list cannot grow or shrink at runtime. Any attempt to resize the list will result in an exception

Initializing a list

Syntax

lst_name[index] = value;

Example

void main() { 
   var lst = new List(3); 
   lst[0] = 12; 
   lst[1] = 13; 
   lst[2] = 11; 
   print(lst); 
}

Output

[12, 13, 11]

Growable List

A growable list’s length can change at run-time

Example

void main() { 
   var num_list = [1,2,3]; 
   print(num_list); 
}

Output

[1, 2, 3]

The following example creates a zero-length list using the empty List() constructor. The add() function in the List class is used to dynamically add elements to the list

void main() { 
   var lst = new List(); 
   lst.add(1); 
   lst.add(2); 
   print(lst); 
} 

Output

[1,2] 

List Properties

The following table lists some commonly used properties of the List class in the dart:core library.