slide in and out animation at React Native (the first bad example)

gistfile1.txt

// the first code 

Animated.parallel([  // 윈도우를 슬라이드인, 페이드인 한다.
    Animated.timing(                  
        this.state.fadeAnim,
        {
            toValue: 1,
            duration: isAndroid ? androidDuration : iosDuration,
            easing: Easing.in(),
            useNativeDriver,
        }
    ),
    Animated.timing(                  
        this.state.transY,
        {
            toValue: shouldFix ? 0 : -visibleWindowHeight,
            duration: isAndroid ? androidDuration : iosDuration,
            easing: Easing.elastic(),
            useNativeDriver,
        }
    )
]).start()

this.closeTimer = setTimeout( () => {
    this.disableButton = true;
    if (!shouldFix) {
        this.timer = null; // 정상적으로 타임아웃이 발생하면 timer 객체를 초기화한다
        Animated.parallel([
            Animated.timing(                  
                this.state.fadeAnim,
                {
                    toValue: 0.01,
                    duration: isAndroid ? androidDuration : iosDuration,
                    easing: Easing.back(),
                    useNativeDriver,
                }
            ),
            Animated.timing(                  
                this.state.transY,
                {
                    toValue: 0,
                    duration: isAndroid ? androidDuration : iosDuration,
                    easing: Easing.back(),
                    useNativeDriver,
                }
            )
        ]).start()
        this.props.closeSimpleAqiGuideNoti()
    }

}, timeout)