function animate(target, current, speed, partialTicks) {
	dif = target - current;
	if (speed < 0) {
		speed = 0;
	}
	if (speed > 1) {
		speed = 1;
	}
	factor = dif * speed * partialTicks;
	if (target > current) {
		current += factor;
	} else {
		current -= factor;
	}
	return current;
}

var shit;
//...(the following lines of code will use Core)
	
	onRender2D: function(event) {
		shit = animate(target_here, shit, speed_here, event.getPartialTicks());
		//too lazy since it's late rn
	}

(TargetHud health bar animation)