Building a Snake Game with React Native and TypeScript | Tutorial for beginners | Code with Beto

Learn how to create a classic Snake game using React Native and TypeScript. You'll learn how to set up the project with Expo, handling user gestures to control the snake, and implementing the game logic such as movement, growth, and collision detection.

It's a practical tutorial for beginners interested in game development with React Native, demonstrating how to structure the app, use gesture handlers, and manage state for a simple but complete game experience.

What's inside

Introduction to the Snake game concept and demo
Setting up a new React Native project with Expo and TypeScript
Using gesture handlers to detect swipe directions
Managing the snake's position and movement logic
Handling snake growth when eating apples
Detecting collisions with walls and game boundaries
Organizing the project structure and utility functions
Styling and creating reusable components

Introduction to the Snake game concept and demo

I start by showing a working Snake game demo built with React Native and TypeScript. The snake moves around the screen controlled by swipe gestures (up, down, left, right). Eating an apple increases the snake's size, and hitting a wall ends the game. The demo also supports pausing and restarting the game.

This sets the stage for the tutorial, explaining the core mechanics and user interactions that will be implemented step-by-step.

Setting up a new React Native project with Expo and TypeScript

To begin, the tutorial uses the Expo CLI to create a new React Native project with TypeScript support. The command used is:

This creates a clean project scaffold. I note that you can also use the React Native CLI if preferred, but Expo simplifies setup especially for beginners.

After creation, the project dependencies are installed with npm, and the development server is started using:

This prepares the environment for coding the Snake game.

Using gesture handlers to detect swipe directions

The tutorial explains how to use the library to detect user swipes. This is essential for controlling the snake's movement direction.

Since Expo is used, the library is installed with:

Gesture handlers listen for swipe events (up, down, left, right) and update the snake's direction accordingly. This approach provides smooth and responsive controls on both iOS and Android devices.

Managing the snake's position and movement logic

The snake's position is tracked as coordinates on an X and Y axis representing the game grid. Movement is handled by copying the snake's head position and incrementing or decrementing the X or Y value based on the swipe direction.

For example, moving right increases X by 1, moving down increases Y by 1, etc. The snake's body is updated by adding the new head position and removing the tail unless the snake has just eaten an apple.

This logic ensures the snake moves fluidly across the screen and grows correctly.

Handling snake growth when eating apples

When the snake eats an apple, the game increases the snake's size by adding a new segment without removing the tail. The apple's position is then randomized within the game bounds.

I explain how to generate random X and Y coordinates within the screen limits (e.g., max 30 on X axis, max 80 on Y axis) to place the apple in a new location.

This mechanic is key to the gameplay loop and scoring.

Detecting collisions with walls and game boundaries

Collision detection is implemented by checking if the snake's head position goes beyond the defined game boundaries. If the X or Y coordinate is less than zero or greater than the maximum allowed value, the game ends.

This ensures the player loses when hitting a wall, maintaining the classic Snake game rules.

Organizing the project structure and utility functions

The tutorial emphasizes creating a scalable and maintainable folder structure:

for React components like the game screen
for shared colors and styles
for TypeScript types
for utility functions such as collision detection and position checks

Abstracting logic into utilities keeps the code modular and easier to manage as the project grows.

Styling and creating reusable components

The snake and apple are rendered using simple React Native components styled to represent each segment visually. The tutorial shows how to use a as the container and apply consistent colors from a centralized colors file.

This approach keeps styling organized and reusable across the app.

Resources

CourseReact Native course

Fundamentals through shipping: the concepts behind the prompts, with lifetime access.

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