🔁 For Loop

Used when the number of iterations is known in advance.

Example:

      for(let i = 0; i < 5; i++) {
        console.log("Count:", i);
      }

Problem:

Print all even numbers from 1 to 10.

Solution:

      for(let i = 1; i <= 10; i++) {
        if(i % 2 === 0) console.log(i);
      }

🔄 While Loop

Best when you don't know how many times you'll loop.

Example:

      let i = 0;
      while(i < 5) {
        console.log("i is:", i);
        i++;
      }

Use Case:

Keep asking user input until a valid number is entered.

♻️ Do...While Loop

Similar to while loop, but executes at least once.

Example:

      let count = 0;
      do {
        console.log("count:", count);
        count++;
      } while(count < 3);

Problem:

Print numbers until a randomly generated number is more than 0.7

      let rand;
      do {
        rand = Math.random();
        console.log(rand);
      } while(rand <= 0.7);

📦 For...of Loop

Used to iterate over iterable values like arrays or strings.

Example:

      const fruits = ["🍎", "🍌", "🍇"];
      for (const fruit of fruits) {
        console.log(fruit);
      }

Use Case:

Loop through characters in a password string to check if it includes digits.

📂 For...in Loop

Used to iterate over object keys.

Example:

      const person = { name: "Alice", age: 25, city: "Paris" };
      for (let key in person) {
        console.log(key + ":", person[key]);
      }

Use Case:

List all properties of a user object for display on a profile page.

🧪 Array.forEach()

Simplifies array iteration with a callback function.

Example:

      const scores = [90, 85, 77];
      scores.forEach((score, index) => {
        console.log(`Score ${index + 1}:`, score);
      });

Use Case:

Logging order items and their prices in an e-commerce app.

🧭 Array.map()

Returns a new array by transforming each element.

Example:

      const prices = [100, 200, 300];
      const withTax = prices.map(p => p * 1.18);
      console.log(withTax);

Use Case:

Apply a transformation (like currency conversion or tax addition).

📝 Summary