Day 18: Sort an Array in Descending Order | Merge Sorting | JavaScript Coding Challenge
Description:
🧑💻 Problem: Write a JavaScript function to sort an array of numbers in descending order. You can use built-in methods or implement a sorting algorithm.
💡 Example Input: [5, 2, 9, 1, 7]
✅ Expected Output: [9, 7, 5, 2, 1]
📌 Concepts Covered: Sorting, Array Methods, Comparison Functions
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📌 Concepts Covered: Sorting Algorithms, Array Methods, Comparison Functions
What is Merge Sort?
Merge Sort is a divide and conquer algorithm that breaks an array into smaller subarrays, sorts them, and then merges them back together in the correct order. It is known for its efficiency and stability in sorting large datasets.
🔹 Time Complexity of Merge Sort:
Best Case: O(n log n)
Average Case: O(n log n)
Worst Case: O(n log n)
Space Complexity: O(n) (due to extra space for merging)
How Merge Sort Works?
1️⃣ Divide: Recursively split the array into two halves until each subarray has only one element.
2️⃣ Conquer: Sort the smaller subarrays.
3️⃣ Merge: Combine the sorted subarrays back together in the correct order.
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