Num

FlxTween can be used to change values over time following a number of available curve functions.

Using num allows you to change a numerical value over time, and pass the value to a function to use however you want.

// create a numeric tween
FlxTween.num(fromValue, toValue, duration, {type: tweenType, easing: easeFunction}, updateFunction);

private function updateFunction(Value:Float):Void
{
    // do something with the value
    console.log(Value);
}

Demonstration

Source

View Source on GitHub 

package;

import flixel.FlxG;
import flixel.FlxSprite;
import flixel.FlxState;
import flixel.text.FlxText;
import flixel.tweens.FlxEase;
import flixel.tweens.FlxTween;
import flixel.util.FlxColor;

class PlayState extends FlxState
{
	var text:FlxText;
	
	override function create()
	{
		super.create();
		
		text = new FlxText();
		text.text = "0";
		text.color = FlxColor.CYAN;
		text.size = 32;
		text.setBorderStyle(FlxTextBorderStyle.SHADOW, FlxColor.BLUE, 4);
		text.screenCenter();
		add(text);
		
		FlxTween.num(0, 100, 10, {type: FlxTweenType.PINGPONG, ease: FlxEase.quintIn}, updateValue);
	}
	
	private function updateValue(value:Float):Void
	{
		text.text = Std.string(Std.int(value));
	}
}