Loops and Iteration

Loops and Iteration

Loops let your code repeat actions without writing the same lines again and again.

Common Loop Types

• for — when you know how many times to run
• while — when you run until a condition changes
• for...of — to iterate collections like arrays

Why use loops?

Loops save time and make your programs flexible — they handle lists, process data, and automate repetitive tasks.

Quick examples

// for loop
for (let i = 1; i <= 5; i++) {
  console.log(i);
}

// while loop
let n = 1;
while (n <= 3) {
  console.log('count', n);
  n++;
}

// for...of with arrays
const fruits = ['apple', 'banana', 'cherry'];
for (const f of fruits) {
  console.log(f);
}