Example to Convert Text to Upper or Lower Case in React Native

Introduction

This is an Example to Convert Text to Upper or Lower Case in React Native. To do this we will use the string property toUpperCase() and toLowerCase() which will convert your text to Upper case and lower case respectively.

Convert Text to Upper Case Using

let uppercasetext = text.toUpperCase(); //To convert Upper Case

Convert Text to Lower Case Using

let lowercasetext = text.toLowerCase(); //To convert Lower Case

Let’s get started with the example.

To Make a React Native App

Getting started with React Native will help you to know more about the way you can make a React Native project. We are going to use react-native init to make our React Native App. Assuming that you have node installed, you can use npm to install the react-native-cli command line utility. Open the terminal and go to the workspace and run

npm install -g react-native-cli

Run the following commands to create a new React Native project

react-native init ProjectName

If you want to start a new project with a specific React Native version, you can use the --version argument:

react-native init ProjectName --version X.XX.X
react-native init ProjectName --version react-native@next

This will make a project structure with an index file named App.js in your project directory.

Code

Open App.js in any code editor and replace the code with the following code

App.js

//Example to Convert Text to Upper or Lower Case in React Native
//https://aboutreact.com/example-to-convert-text-to-upper-or-lower-case-in-react-native/

//import React in our code
import React, {useState} from 'react';

//import all the components we are going to use
import {SafeAreaView, StyleSheet, Text, View, Button} from 'react-native';

const App = () => {
  const [defaultText, setDefaultText] = useState('About React');

  const convertTextToUpperCase = () => {
    //To convert Upper Case
    let upperCaseText = defaultText.toUpperCase();
    setDefaultText(upperCaseText);
  };

  const convertTextToLowerCase = () => {
    //To convert Lower Case
    let lowerCaseText = defaultText.toLowerCase();
    setDefaultText(lowerCaseText);
  };

  const convertTextToTitleCase = () => {
    let camelCaseText = defaultText
      .split(' ')
      .map(function (word, index) {
        // First character upper case else lower case
        return word.charAt(0).toUpperCase() + word.slice(1).toLowerCase();
      })
      .join(' ');
    setDefaultText(camelCaseText);
  };

  return (
    <SafeAreaView style={{flex: 1}}>
      <View style={styles.container}>
        <Text style={styles.textStyle}> {defaultText} </Text>
        <View style={{marginTop: 10}}>
          <Button
            title="Convert Text To Upper Case"
            onPress={convertTextToUpperCase}
            color="#606070"
          />
        </View>
        <View style={{marginTop: 10}}>
          <Button
            title="Convert Text To Lower Case"
            onPress={convertTextToLowerCase}
            color="#606070"
          />
        </View>
        <View style={{marginTop: 10}}>
          <Button
            title="Convert Text To Title Case"
            onPress={convertTextToTitleCase}
            color="#606070"
          />
        </View>
      </View>
    </SafeAreaView>
  );
};

const styles = StyleSheet.create({
  container: {
    flex: 1,
    justifyContent: 'center',
    alignItems: 'center',
  },
  textStyle: {
    fontSize: 25,
    textAlign: 'center',
  },
});

export default App;

To Run the React Native App

Open the terminal again and jump into your project using.

cd ProjectName

To run the project on an Android Virtual Device or on real debugging device

react-native run-android

or on the iOS Simulator by running (macOS only)

react-native run-ios

Download Source Code

Output Screenshots

Android

          

IOS

         

Output in Online Emulator

This is how you can convert text to upper or lower case. If you have any doubts or you want to share something about the topic you can comment below or contact us here. There will be more posts coming soon. Stay tuned!

Hope you liked it. 🙂


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