How can I use map and filter in real-world applications?

How can I use map and filter in real-world applications?

Map and filter are powerful functions in programming, especially in languages like JavaScript and Python. They allow you to transform and filter data efficiently.

Can you give me a practical example using JavaScript?

Sure! Imagine you have an array of numbers and you want to double each number and then filter out the ones greater than 10. You can use map to double the numbers and filter to get the desired results.

That sounds useful! Can you show me the code for that?

Absolutely! Here's a simple example:

const numbers = [1, 2, 3, 4, 5, 6];
const doubledAndFiltered = numbers.map(num => num * 2).filter(num => num > 10);
console.log(doubledAndFiltered); // Output: [12]

What about using map and filter in Python?

In Python, you can achieve similar results using list comprehensions. For example:

numbers = [1, 2, 3, 4, 5, 6]
doubled_and_filtered = [num * 2 for num in numbers if num * 2 > 10]
print(doubled_and_filtered)  # Output: [12]