JavaScript

JavaScript allows you to sort arrays using the built-in sort() method.

You can sort strings, numbers, and even use custom sorting logic using compare functions.

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✅ 1. sort() – Sort Alphabetically (Strings)

The sort() method sorts the array in place, converting elements to strings by default.

let fruits = ["Banana", "Apple", "Orange"];
fruits.sort();

console.log(fruits); // ["Apple", "Banana", "Orange"]

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⚠️ Warning with Numbers

let numbers = [100, 20, 3];
numbers.sort();

console.log(numbers); // [100, 20, 3] => Actually becomes ["100", "20", "3"]

❗ sort() converts numbers to strings by default, which can cause incorrect results.

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✅ 2. Sorting Numbers Correctly

To sort numbers properly, use a compare function:

🔼 Ascending Order:

let numbers = [100, 20, 3];
numbers.sort((a, b) => a - b);

console.log(numbers); // [3, 20, 100]

🔽 Descending Order:

numbers.sort((a, b) => b - a);
console.log(numbers); // [100, 20, 3]

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✅ 3. reverse() – Reverse the Order

You can also reverse the order of elements in an array.

let colors = ["Red", "Green", "Blue"];
colors.reverse();

console.log(colors); // ["Blue", "Green", "Red"]

💡 Use .sort().reverse() to sort in descending order for strings.

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✅ 4. Sort an Array of Objects

You can also sort objects based on properties.

📅 Sort by Numeric Property:

let products = [
  { name: "Pen", price: 20 },
  { name: "Pencil", price: 10 },
  { name: "Notebook", price: 50 }
];

products.sort((a, b) => a.price - b.price);
console.log(products);
// Sorted by price: Pencil, Pen, Notebook

🔤 Sort by String Property:

products.sort((a, b) => a.name.localeCompare(b.name));
console.log(products);
// Sorted alphabetically by name

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📌 Summary Table

Method	Description
sort()	Sorts array (as strings by default)
reverse()	Reverses array order
compareFunction	Allows custom sorting logic
localeCompare()	Sort strings with correct locale rules

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🧠 Final Tips

• Use a compare function when sorting numbers or objects.
• Combine sort() and reverse() for simple descending sorts.
• Use localeCompare() for accurate string sorting in other languages.

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