# JS - Help understanding the answer to following piece of code

Hey all. So I’m in the field of IT, but programming is nowhere near my specialty, however, I’ve decided to try and learn some JS. Has been going fine so far, however was on the Codecademy app and the below question sprung up.

I know the answer is 12… but I’m not entirely sure how

Apologies in advance, as I know this is an incredibly simple question, but my brain just can’t work it out ``````number1 += number2 // same as number1 = number1 + number2
``````

number1 is 5 after the first reassignment (line 3)

``````number2 += number1 // same as number2 = number2 + number1 ---> 2 + 5 = 7
``````

number2 is 7 after the 2nd reassignment (line 4)

So the last line adds 5 (new number1) + 7 (new number2)

5 Likes

Ah reading that now, it makes sense.

Thank You for the explanation 1 Like

Hey there!
I know JavaScript can we a little bit messy and confusing when starting out. I’ve been there too! but don’t worry, I’ll explain this problem for you.

When we execute the code, the variable `number1` is initially assigned a value of `3` and the variable `number2` is initially assigned a value of `2`.

Then, we update the value of `number1` to be the sum of `number1` and `number2`, which means `number1` now has the value `5` (i.e., `number1 += number2` is equivalent to `number1 = number1 + number2`, so `number1` becomes `3 + 2 = 5`).

Next, we update the value of `number2` to be the sum of `number2` and the new value of `number1`, which means `number2` now has the value `7` (i.e., `number2 += number1` is equivalent to `number2 = number2 + number1`, so `number2` becomes `2 + 5 = 7`).

Finally, we calculate the sum of `number1` and `number2` and store the result in the variable `result`. Since `number1` is `5` and `number2` is `7`, the value of `result` becomes `5 + 7 = 12`.

Therefore, the value of `result` is `12`. Hope this helps, and good luck!