Why isn't the "loop getting displayed when string is used instead of variable"? but it's working for variable with same string value.

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I'm learning JavaScript, and I came across a problem.
I wanted to see the loop until infinity for 2*2. I've initialized two variable x and y. I wrote a while loop ( while(x != Infinity){} ).

It's working when write like this:
(y = y + x + "<br>";).
But not when I wrote like this:
(y = "" + x + "<br>";).

I couldn't understand the difference. It seems like both the lines are same. Can someone please help me understand the concept?

Thank you:)

What I have tried:

<!DOCTYPE html>
<html>
<body>

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

<script>
var x = 2;
var y = "";
while(x != Infinity){
x = x * x;
y = "" + x + "<br>";
document.getElementById("demo").innerHTML = y;
}
</script>

</body>
</html>

Posted 18-Dec-17 18:34pm

Member 13583764

Updated 18-Dec-17 19:34pm

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Karthik_Mahalingam · Answer 1 · 2017-12-18T19:34:00

Solution 1

if you see this line

y = "" + x + "<br>"

you are keep on overwriting the variable y from 0 to Infinity so at the end of the loop the last value will be stored to the variable which is Infinity
You should append the value to variable to see the entire loop result.
use

y += x + "<br>"

Posted 18-Dec-17 19:34pm

Karthik_Mahalingam

v2