FAQ: Core Components - Combining components

Frequently Asked Questions Uncategorized
1

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This community-built FAQ covers the “Combining components” exercise from the lesson “Core Components”.

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This exercise can be found in the following Codecademy content:

Learn React Native

FAQs on the exercise Combining components

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2

Hello, I know I’m doing something wrong here because I keep receiving the error that “Box needs a color of red”, but red is already declared… Please advise on what I am doing wrong. Thanks!!

import React from 'react';
import { View, Text } from 'react-native';

const App = (props) => (
  <View style={{ flex: 1, justifyContent: 'center' }}>
    <Box style={{ width: 100, height: 100, backgroundColor: 'red' }} color={props.color}/>
    <Box style={{ width: 100, height: 100, backgroundColor: 'green' }} color={props.color}/>
    <Box style={{ width: 100, height: 100, backgroundColor: 'blue' }} color={props.color}/>
  </View>
);

export default App;

export const Box = (props) => ( 
  <View color={props.color} style={{ width: 100, height: 100, backgroundColor: props.color }} />
);
3

I just figured it out… Here is the correct code:

import React from 'react';
import { View, Text } from 'react-native';

const App = (props) => (
  <View style={{ flex: 1, justifyContent: 'center' }}>
    <Box color={'red'} style={{ width: 100, height: 100, backgroundColor: props.color }}/>
    <Box color={'green'} style={{ width: 100, height: 100, backgroundColor: props.color }}/>
    <Box color={'blue'} style={{ width: 100, height: 100, backgroundColor: props.color }}/>
  </View>
);

export default App;

export const Box = (props) => ( 
  <View color={props.color} style={{ width: 100, height: 100, backgroundColor: props.color }} />
);
1 Like
4

I think you’re duplicating code there. It should simply be:

<Box color={'red'} /> <Box color={'green'} /> <Box color={'blue'} />

My first instinct was actually to think of it as a function but this didn’t work:

Box({color: 'red'});
5 
import React from 'react';
import { View, Text } from 'react-native';

const App = () => (
  <View style={{ flex: 1, justifyContent: 'center' }}>
    <Box color="red" />
    <Box color="green" />
    <Box color="blue" />
  </View>
);

export default App;

export const Box = ({ color }) => (
  <View style={{ width: 100, height: 100, backgroundColor: color || 'red' }} />
);

I saw this solution and it kind of defeats the point of making it reusable components, color is a property that can be assigned to each box component and we can pass it as an object to our Box component.