Цикли
for (i=0; i<10; i++) {
}
while (a < 10) {
}
do {
} while (a < 10);
break
continue
let mas = [10, 20, 30];
for (let value of mas) {
console.log(value)
}
var person = {fname:"Майстер", lname:"Йодо", age:125};
var x;
for (x in person) {
txt += person[x] + " ";
}
var i;
var l = arr.length; // краще
for (i = 0; i < l; i++) {
}