JavaScript Loops

BEGINNERS & HELP
#1

Hello,

I am new a this programming thing. I am now at the JavaScript course, reading assignment about loops.
I wrote this code from the book in the console, but it’s something I don’t understand.

let number = 0;
while (number <= 12) {
console.log(number);
number = number + 2;
}

In the console appear all the even numbers from 0 to 14. I thought it should stop at 12.

Here is a screenshot from the console.
https://gyazo.com/908f266e8c2a5b219d05de78b4141ac5

#2

The 14 printed after that is not from a console.log() call, it’s the value of the last expression executed, the final number = number + 2; that brings numbers up to 14 and causes the while loop to terminate.
if you use ‘document.write(number)’ you’ll see that 14 won’t be executed.

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#3

I understand now. Thank you very much!

1 Like