how to make a javascript for loop

var colors=["red","blue","green"];
for (let i = 0; i < colors.length; i++) { 
  console.log(colors[i]);
}

var tops = [1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144];
for (let i = 0; i < tops.length; i++) {
  document.write(tops[i] + "tops");
}

for (statement 1; statement 2; statement 3) {

      // code block to be executed

 }

 

let txt = 'JavaScript';
for (let x of txt) { 
  document.write(x + "<br >");
}
let cars = ['BMW', 'Volvo', 'Mini'];
for (let x of cars) {
   document.write(x + "<br >");
}