Data commit

Task/Arrays/Dart/arrays.dart

@@ -0,0 +1,41 @@
+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');
+
+
+}