Why advanced features enable production apps in Svelte - See It in Action

Why advanced features enable production apps

📖 Scenario: You are building a simple Svelte app to show how advanced features help make production-ready applications.This app will display a list of tasks and highlight those that are urgent.

🎯 Goal: Create a Svelte component that uses reactive statements and stores to manage and display urgent tasks clearly.

📋 What You'll Learn

Create a list of tasks with name and urgency status

Add a reactive variable to filter urgent tasks

Use a Svelte store to hold a threshold for urgency

Display all tasks and highlight urgent ones

💡 Why This Matters

🌍 Real World

Managing and highlighting important tasks or items dynamically is common in productivity apps, dashboards, and notifications.

💼 Career

Understanding reactive stores and conditional rendering in Svelte is essential for building maintainable and responsive user interfaces in professional web development.

1

Create the initial tasks list

Create a variable called tasks that is an array of objects with these exact entries: { name: 'Pay bills', urgent: true }, { name: 'Clean house', urgent: false }, { name: 'Buy groceries', urgent: true }.

Svelte

// Your code here

Hint

Use let tasks = [ ... ] with objects inside the array.

2

Add a Svelte store for urgency threshold

Import writable from 'svelte/store' and create a store called urgencyThreshold with the initial value true.

Svelte

let tasks = [
  { name: 'Pay bills', urgent: true },
  { name: 'Clean house', urgent: false },
  { name: 'Buy groceries', urgent: true }
];

// Your code here

Hint

Use import { writable } from 'svelte/store' and then const urgencyThreshold = writable(true).

3

Create a reactive filtered list of urgent tasks

Add a reactive statement using $: to create a variable called urgentTasks that filters tasks where task.urgent === $urgencyThreshold.

Svelte

import { writable } from 'svelte/store';

let tasks = [
  { name: 'Pay bills', urgent: true },
  { name: 'Clean house', urgent: false },
  { name: 'Buy groceries', urgent: true }
];

const urgencyThreshold = writable(true);

// Your code here

Hint

Use $: urgentTasks = tasks.filter(task => task.urgent === $urgencyThreshold) to reactively update urgentTasks.

4

Display tasks and highlight urgent ones

Write HTML to loop over tasks using {#each tasks as task} and display each task.name. Add a class="urgent" to the <li> if task.urgent is true. Also add a