1.
for (i=0; i<10; i++) {
}
2.
while (a < 10) {
}
3.
do {
} while (a < 10);
break
continue
let mas = [10, 20, 30];
for (let value of mas) {
console.log(value)
}
let person = {fname:"Тарас", lname:"Шевченко", year:1814};
let x;
for (x in person) {
txt += person[x] + " ";
}
let i;
let n = arr.length; // краще
for (i = 0; i < n; i++) {
}