JavaScript Core | VoidX Academy

6. Loops

Iteration

Loops

Loops allow you to run the same block of code multiple times. Computers excel at repetitive tasks, and loops are how we trigger them.

A for loop is used when you know exactly how many times you want the code to run. It consists of an initializer, a condition, and an incrementer.

for (let i = 1; i <= 5; i++) {
    console.log("Iteration number:", i);
}

OutputIteration number: 1
Iteration number: 2
Iteration number: 3
Iteration number: 4
Iteration number: 5

A while loop runs continuously as long as its condition remains true. Use it when you don't know how many iterations are needed.

let countdown = 3;

while (countdown > 0) {
    console.log(countdown);
    countdown--;
}
console.log("Liftoff!");

Output3
2
1
Liftoff!

break instantly destroys the loop. continue skips the rest of the current cycle and jumps to the next iteration.

for (let i = 1; i <= 5; i++) {
    if (i === 3) {
        continue;
    }
    if (i === 5) {
        break;
    }
    console.log(i);
}

Output1
2
4

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