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Create a Temperature Converter with React and JavaScript

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React is an easy to use JavaScript framework that lets us create front end apps.

In this article, we’ll look at how to create a temperature converter with React and JavaScript.

Create the Project

We can create the React project with Create React App.

To install it, we run:

npx create-react-app temperature-converter

with NPM to create our React project.

Create the Temperature Converter

To create the temperature converter, we write:

import React, { useState } from "react";

export default function App() {
  const [celsius, setCelsius] = useState(0);
  const [fahrenheit, setFahrenheit] = useState(0);

  const convert = (e) => {
    e.preventDefault();
    const formValid = !isNaN(+celsius);
    if (!formValid) {
      return;
    }
    setFahrenheit(+celsius * (9 / 5) + 32);
  };

  return (
    <div className="App">
      <form onSubmit={convert}>
        <div>
          <label>temperature in celsius</label>
          <input value={celsius} onChange={(e) => setCelsius(e.target.value)} />
        </div>
        <button type="submit">convert</button>
      </form>
      <div>
        {celsius}c is {fahrenheit}f
      </div>
    </div>
  );
}

We have the celsius and fahrenheit states which we use to set the celsius and Fahrenheit values respectively.

The convert function is where we convert the celsius value to fahrenheit .

In it, we call e.preventDefault() to do client-side form submission.

Then we check is celsius is a number with isNaN .

If it’s a number, then we call setFahrenheit with the formula to compute the Fahrenheit from the celsius .

Below that, we have the form element with the onSubmit prop set to convert .

In it, we have an input to let us set the celsius .

value is set to celsius and the onChange prop is set to a function to set the celsius value.

e.target.value has the inputted value.

onSubmit is run when we click the button with type submit .

Below that, we display the celsius value and the fahrenheit equivalent.

Conclusion

We can create a temperature converter easily with React and JavaScript.

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