🔥 Callback vs Fallback in JavaScript 🔥

Understanding the difference between callbacks and fallbacks is key to writing robust JavaScript code!

1. Callback: Function executed later

• Purpose: Handles async tasks (e.g., API requests).

• Example: Food delivery app

📦 Place an order ➡️ Get notified when it’s delivered.

function getData(url, callback) {

fetch(url)

.then(response => response.json())

.then(data => callback(data));

}

getData('https://api.example.com/orders', data => console.log(data));

2. Fallback: Default action if something fails

• Purpose: Backup plan or default value.

• Example: Streaming app

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function getPreferredLanguage(user) {

return user.language || 'en'; // Fallback to 'en'

}

console.log(getPreferredLanguage({ name: 'Alice' })); // 'en'

💡 Key Difference:

• Callback: Executes after a task.

• Fallback: Kicks in when something fails.

⚒️ Use both strategically for resilient and user-friendly code!