arraysreact-nativeglobal

React Native trying to use same array globally


I am trying to learn React Native and am wondering if there is a way to store an array, say in a constant file or something, and reuse it in different components. States will be one, as an example. I want to create an array of States for a dropdown select component (I am using react-native-element-dropdown for that) and use it in several different components. The array would be like:

const states = [
    { label: 'Alabama', value: 'AL' },
    { label: 'Alaska', value: 'AK' },
    { label: 'Arizona', value: 'AZ' },
    { label: 'Arkansas', value: 'AR' },
    { label: 'California', value: 'CA' },
    { label: 'Colorado', value: 'CO' },
    { label: 'Connecticut', value: 'CT' },
    { label: 'Delaware', value: 'DE' },
];

I'm not even sure there is a way to do this, but everything I have tried so far has errored out with too many renders errors. I have to ask before I start copying and pasting these long arrays :-)


Solution

  • To achieve what you're trying to do, you can follow these steps:

    Create a constants file to define the array of states.

    Import and use the array in your components as needed.

    Step 1: Create a constants file

    Create a file, for example constants.js, and define your array of states there:

    export const states = [
    { label: 'Alabama', value: 'AL' },
    { label: 'Alaska', value: 'AK' },
    { label: 'Arizona', value: 'AZ' },
    { label: 'Arkansas', value: 'AR' },
    { label: 'California', value: 'CA' },
    { label: 'Colorado', value: 'CO' },
    { label: 'Connecticut', value: 'CT' },
    { label: 'Delaware', value: 'DE' },
    ];
    

    Step 2: Import and use the array in your components.

    Now, in any component where you need to use this array, simply import it and use it:

    import React from 'react';
    import { View } from 'react-native';
    import { Dropdown } from 'react-native-element-dropdown';
    import { states } from './constants';  // Adjust the path according to your project structure
    
    const MyComponent = () => {
        return (
            <View>
                <Dropdown
                    data={states}
                    labelField="label"
                    valueField="value"
                    placeholder="Select a state"
                    // other necessary props
                />
            </View>
        );
    };
    
    export default MyComponent;