Javascript Loop based on input

March 19, 2022

I have a case:
If The user input 3, then the output should be 1 2 start.
If the user input 5, then the output should be 1 2 3 4 start.
If the user input more than 9, then the output should be Error.

I tried the following code, but no idea how can I add the last number into string

<!DOCTYPE html>
<html>
<body>

<p id="demo"></p>

<script>
let text = "";
for (let i = 1; i < 5; i++) {
  if (i == 5) break;
  text += i + "<br>";
}
document.getElementById("demo").innerHTML = text;
</script>

</body>
</html>

Any idea please?
Really appreciated.

Thank you.

>Solution :

Wrap you for loop in a function. Then you can concat the numbers and append the word start on return.

const input = 15;
console.log(countdown(input))

function countdown(input) {
  if (input > 9) {
    return 'Error!';
  }
  c = '';
  for (let i = 1; i < input; i++ ) {
    c += ' ' + i;
  }
  return c + ' start';
}

In your case

    const input = 5;
    
    document.getElementById("demo").innerHTML = countdown(input);
    function countdown(input) {
      if (input > 9) {
        return 'Error!';
      }
      c = '';
      for (let i = 1; i < input; i++ ) {
        c += ' ' + i + '<br/>';
      }
      return c + ' start';
    }