Typed Group

Using a FlxTypedGroup will allow you to specify the class that will be contained in the group (FlxGroup is an alias for FlxTypedGroup<FlxBasic>).

This can be very useful when passing group-members to functions without having to cast them.

// create a FlxTypedGroup called group, specifying that is contains Sprite objects, and has a maximum of 10
var group = new FlxTypedGroup<Sprite>(10);

Demonstration

Source

View Source on GitHub 

package;

import flixel.FlxG;
import flixel.FlxState;
import flixel.group.FlxGroup.FlxTypedGroup;

class PlayState extends FlxState
{
	override function create()
	{
		super.create();
		
		var group = new FlxTypedGroup<Sprite>(10);
		add(group);
		
		for (i in 0...group.maxSize)
		{
			group.add(new Sprite());
		}
	}
}


package;

import flixel.FlxG;
import flixel.FlxSprite;
import flixel.system.FlxAssets.FlxGraphicAsset;

class Sprite extends FlxSprite
{
	public function new()
	{
		super("assets/sprite.png");
		setPosition(FlxG.random.int(0, Std.int(FlxG.width - width)), FlxG.random.int(0, Std.int(FlxG.height - height)));
		velocity.set(FlxG.random.int(50, 200) * FlxG.random.sign(), FlxG.random.int(50, 200) * FlxG.random.sign());
	}
	
	override function update(elapsed:Float)
	{
		if ((velocity.x > 0 && x + width >= FlxG.width) || (velocity.x < 0 && x <= 0))
			velocity.x *= -1;
		if ((velocity.y > 0 && y + height >= FlxG.height) || (velocity.y < 0 && y <= 0))
			velocity.y *= -1;
			
		super.update(elapsed);
	}
}