React Native - card animation addCard

    addCard = (y) => {
        const { cards } = this.state;
        const newStack = [...cards];
        const style = { ...styles.dropCard };
        style.top = y;
 
        const card = (
            <view key="{y}" style="{style}">
                <text>Sample</text>
            </view>
        )
 
        newStack.push(card);
        this.setState({ cards: newStack })
    }