Arrays: Difference between revisions

=={{header|Dart}}==

<lang javascript>

main(){

// Dart uses Lists which dynamically resize by default

final growable = [ 1, 2, 3 ];

// Add to the list using the add method

growable.add(4);

print('growable: $growable');

// You can pass an int to the constructor to create a fixed sized List

final fixed = List(3);

// We must assign each element individually using the Subscript operator

// using .add would through an error

fixed[0] = 'one';

fixed[1] = 'two';

fixed[2] = 'three';

print('fixed: $fixed');

// If we want to create a fixed list all at once we can use the of constructor

// Setting growable to false is what makes it fixed

final fixed2 = List.of( [ 1.5, 2.5, 3.5 ], growable: false);

print('fixed2: $fixed2');

// A potential gotcha involving the subscript operator [] might surprise JavaScripters

// One cannot add new elements to a List using the subscript operator

// We can only assign to existing elements, even if the List is growable

final gotcha = [ 1, 2 ];

// gotcha[2] = 3 would cause an error in Dart, but not in JavaScript

// We must first add the new element using .add

gotcha.add(3);

// Now we can modify the existing elements with the subscript

gotcha[2] = 4;

print('gotcha: $gotcha');

}

</lang>

{{out}}

<pre>

growable: [1, 2, 3, 4]

fixed: [one, two, three]

fixed2: [1.5, 2.5, 3.5]

gotcha: [1, 2, 4]

</pre>