For Loops

For Loops

The classic for loop has three parts: initializer, condition, and update:

for (let i = 0; i < 5; i++) {
    console.log(i);
}
// prints 0, 1, 2, 3, 4

1. let i = 0 — runs once at the start
2. i < 5 — checked before each iteration; loop stops when false
3. i++ — runs after each iteration

Summing Numbers

let total = 0;
for (let i = 1; i <= 10; i++) {
    total += i;
}
console.log(total);  // 55

for...of

for...of iterates over the values in an array:

const fruits = ["apple", "banana", "cherry"];
for (const fruit of fruits) {
    console.log(fruit);
}

Your Task

Write function sumTo(n) that returns the sum of all integers from 1 to n (inclusive). Use a for loop.