for i and j javascript code example

Example 1: javascript for

let str = "";

for (let i = 0; i < 9; i++) {
  str = str + i;
}

console.log(str);
// expected output: "012345678"

Example 2: js for

for (let step = 0; step < 5; step++) {
  // Runs 5 times, with values of step 0 through 4.
  console.log(step);
}
0
1
2
3
4