✅ Programming Basics – Part 6: Sets 📚🧠

✅ What is a Set?
A set is a collection of unique, unordered elements. It doesn’t allow duplicates.

➊ How to Create a Set

📍 Python

fruits = {"apple", "banana", "cherry"}

📍 Java

Set<String> fruits = new HashSet<>();
fruits.add("apple");
fruits.add("banana");
fruits.add("cherry");

➋ Properties of Sets
✔️ No duplicate values
✔️ No guaranteed order
✔️ Fast membership tests (in, contains)

➌ Add Elements

📍 Python: fruits.add("mango")
📍 Java: fruits.add("mango");

➍ Remove Elements

📍 Python: fruits.remove("banana")
📍 Java: fruits.remove("banana");

➎ Check Membership

📍 Python: "apple" in fruits
📍 Java: fruits.contains("apple")

➏ Loop Through a Set

📍 Python:

for fruit in fruits:
    print(fruit)

📍 Java:

for(String fruit : fruits) {
    System.out.println(fruit);
}

➐ Why Use Sets?

• Eliminate duplicates from data
• Fast checks for existence
• Efficient in set operations (union, intersection)

➑ Real-World Uses of Sets

• Store unique tags or categories
• Track visited pages
• Remove duplicates from a list
• Fast user lookup in access control systoperations fast!*