while loop, JavaScript printing unexpected value

Question

I have gone through this Question and Answer While loop inside while loop JavaScript

function getMaxLessThanK(n, k) {

  let i = 1;

  while (i < n) {
    let j = i + 1;
    while (j < n + 1) {
      console.log(i, j)
      j++
    }
    i++
  }
}

when n = 5, what am I getting is

How to avoid this the last line undefined. what is the reason for it?

Can anyone help on this please?

Edit:

This is what the actual thing I am doing below.

is it from this code block or someplace else your using this function which is printing this — Srinjoy Choudhury
– Srinjoy Choudhury, Commented May 22, 2022 at 5:45
Do you also log the result of the function call? Like console.log(getMaxLessThanK(5))? Your function returns undefined. — Ram
– Ram, Commented May 22, 2022 at 5:45
No, I my self wrote this code while trying to solve one of the HackerRank Question — PRATAP-PANABAKA
– PRATAP-PANABAKA, Commented May 22, 2022 at 5:46
@Ram yes, exactly, n =5, k=4, console.log(getMaxLessThanK(n) — PRATAP-PANABAKA
– PRATAP-PANABAKA, Commented May 22, 2022 at 5:47
So this is because you are logging the returned value of the function which is undefined. This is the answer you are looking for. undefined is not an unexpected value. — Ram
– Ram, Commented May 22, 2022 at 5:51

Megrax · Accepted Answer · 2022-05-22 05:51:41Z

2

If you're running it in a console and get an undefined like this：

This undefined indicates that your statement runs without returning a value. It's not a result of your console.log.

If you make the function return something:

function getMaxLessThanK(n, k) {

  let i = 1;

  while (i < n) {
    let j = i + 1;
    while (j < n + 1) {
      console.log(i, j)
      j++
    }
    i++
  }
    return 'return value';
}

Then you'll get

answered May 22, 2022 at 5:51

Megrax

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1 Comment

PRATAP-PANABAKA Over a year ago

Thank You. I got the concept with your answer.

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