Svelte For Dummies In a Hurry

Key Takeaways #

1. Svelte is a simple and pragmatic framework ideal for developers who want to get things done quickly.
2. Svelte apps are built using components, which manage state and automatically update the DOM when changes occur.
3. Svelte follows the single file component structure, keeping JavaScript logic, HTML templates, and CSS rules together.

Svelte Fundamentals #

• Components:
  • Svelte apps consist of components, which are self-contained units of code responsible for managing their own state and rendering to the DOM.
• Reactivity:
  • Svelte utilizes a reactive system that automatically updates the DOM when data changes.
  • Runes: Special functions that manage and track reactive state using signals.
  • Derived state: Allows declarative derivation of state based on existing reactive variables.
  • Effect Rune: Executes code that has side effects outside the reactivity context.
• Component Lifecycle:
  • Unmount: Lifecycle hook that runs after a component is removed from the DOM, a suitable place to clean up state or resources.

Building a To-Do App with Svelte #

• State Management:
  • Utilize runes to manage the state of your to-do list.
  • Update the list using the method, and Svelte handles DOM updates automatically.
• Data Binding:
  • Use curly braces to display data in the DOM.
  • Implement one-way data binding for capturing user input and two-way data binding for interactive elements.
• Component Structure:
  • Create separate child components for reusable UI elements (e.g., task line).
  • Use properties to pass data and behavior between parent and child components.
• Templates:
  • Utilize the block to iterate over lists of elements.
  • Ensure each element has a unique ID for efficient DOM synchronization.
• TypeScript Support:
  • Svelte offers native TypeScript support, which can be enabled by specifying the attribute in the script tag.

"Svelte apps are components or collections of components which keep track of State AKA data and automatically update the Dom when the data is changed by various user or server events."

"Spell components follow the single file structure where the JavaScript Logic the HTML template and the CSS rules are all stored under the same file."

"what you might not realize is that you can simply push your new task into the list and the framework will take care of all the derived values effect functions and dumb updates for you."

Summary for: Youtube