Build a To-do List with Hyperapp, the 1KB JS Micro-framework

This tutorial guides you through building a to-do list application using Hyperapp, a lightweight JavaScript framework. Ideal for those wanting to explore functional programming principles without getting bogged down in complexities.

Hyperapp's popularity stems from its pragmatic approach and minuscule size (1.4 kB), delivering performance comparable to React and Redux.

Key Concepts:

• Hyperapp's Triad: Hyperapp centers around three core components: state (a single, immutable data source), actions (pure functions updating the state), and views (functions rendering the UI based on the state).
• Virtual DOM: Hyperapp leverages a virtual DOM for efficient UI updates, similar to React.
• State Management: Its state management resembles Redux, simplifying data handling.
• Tutorial Focus: This tutorial covers creating, completing, and deleting to-do items, illustrating Hyperapp's core mechanics.
• Pure Actions: Actions are pure functions, ensuring predictable state transitions and immutability.
• Interactive Web Apps: The tutorial demonstrates Hyperapp's capacity for building interactive web applications.

What is Hyperapp?

Hyperapp builds dynamic, single-page web apps using a virtual DOM for speedy UI updates (like React) and a single state object (like Redux) for streamlined state management. Its foundation is inspired by the Elm architecture.

Hyperapp's three main parts:

• State: A single object tree storing all app data.
• Actions: Functions modifying the state.
• View: A function returning virtual nodes (translating to HTML), using JSX or similar templating, accessing both state and actions.

Getting Started (using CodePen):

1. Set the JavaScript preprocessor to Babel in CodePen.
2. Import Hyperapp: https://unpkg.com/hyperapp
3. Import app and h: const { h, app } = hyperapp;
4. Enable JSX: /** @jsx h */
5. Initialize the app: const main = app(state, actions, view, document.body);

Building the To-Do List App (Hyperlist):

The tutorial then walks you through building a to-do list app step-by-step, covering:

• Initial State and View: Defining the initial state (items, input) and a basic view structure.
• Adding Tasks: Creating an action (add) to add new tasks to the list, updating the state immutably.
• Marking Tasks as Complete: Implementing an action (toggle) to change the completed status of tasks.
• Deleting Tasks: Adding an action (destroy) to remove individual tasks.
• Clearing Completed Tasks: Creating an action (clearAllCompleted) to remove all completed tasks.

The tutorial provides code snippets for each step, including components for adding items (AddItem) and displaying list items (ListItem), and detailed explanations of the actions and their functionality. It emphasizes the use of pure functions and immutable state updates throughout the process.

Conclusion:

The tutorial concludes by summarizing the process and encouraging further exploration of Hyperapp's capabilities and resources, including its documentation, source code, and community support. It also suggests future enhancements to the to-do list application. A final section addresses frequently asked questions about Hyperapp and its use in building a to-do list.

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