for文
for (let i = 0; i < 7; i++) {
console.log(i);
}
for...of文
const array1 = ['a', 'b', 'c'];
for (const element of array1) {
console.log(element);
}
for...in文
const object = { a: 1, b: 2, c: 3 };
for (const property in object) {
console.log(`${property}: ${object[property]}`);
}