... react-native function 组件中的属性

Question

I have the following function component in a react-native app. In second line of code, there is ...attributes which is confusing. While I understand that it represents spread syntax in newer JavaScript version, but I cannot find what does attributes mean. If it said ..props then that is understandable. I tried to google but couldn't find any suitable answer.

Question

What does attrributes denote in second line of code snippet below?

  const Loader = (props) => {
  const { loading, loaderColor, loaderText, ...attributes } = props;

  return (
    <Modal
      transparent={true}
      animationType={'none'}
      visible={loading}
      onRequestClose={() => {
        console.log('close modal');
      }}>
      <View style={styles.modalBackground}>
        <View style={styles.activityIndicatorWrapper}>
          <ActivityIndicator
            animating={loading}
            color={loaderColor? loaderColor : '#0000ff'}
            size={Platform.OS === 'ios' ? 'large' : 75}
          />
          {loaderText ? (
            <View style={{ flexDirection: 'row' }}>
              <Text style={styles.modalText}>{loaderText}</Text>
            </View>
          ) : (
            ''
          )}
        </View>
      </View>
    </Modal>
  );
};

Answer 1

attributes is the name of the newly created constant containing the rest properties from props .

 const { a, b, ...objectContainingEveryOtherPropertyExceptAB } = { a: 1, b: 2, c: 3, d: 4 }; console.log(objectContainingEveryOtherPropertyExceptAB);

So if you use your component like this <Loader loading foo="bar" /> then attributes will be equal to { foo: 'bar' }