React State: Emoji Passcode Checker

In the src/App.js file, you can find the building blocks for an emoji passcode checker.

Looking at the validCode variable, we understand that the code consists of a sequence of three emojis. Each button click should “lock in” one emoji. If the code that was entered matches the passcode, your code will be confirmed as valid. The reset button should reset the code, so you can start over. Toward the bottom of the App function you’ll find a line that conditionally generates a p element as soon as the input code matches the validCode declared at top of the function.


You can use the following hints as a guideline:

  • Most importantly, you need to import a built-in React function you’ll be using during this challenge.
  • You need to make sure to declare a state variable.
  • Write a handleClick function that updates the state variable according to which emoji button was clicked.
    • Hint: (use code + to append the new emoji)




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Local development

To run project commands locally, you need to install the dependencies using npm i first.

You can then use the following commands:

  • npm run start to start the development server

💡 This project requires a bundler. You can use npm run start to start the development server. You can then view the project in the browser at http://localhost:3000. The Live Preview Extension for Visual Studio Code will not work for this project.


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