# Learn Basic OOP by Building a Shopping Cart - Step 24 **URL:** \ **Category:** Curriculum Help\ **Tags:** javascript\ **Created:** [January 15, 2024, 7:26pm UTC](https://forum.freecodecamp.org/t/learn-basic-oop-by-building-a-shopping-cart-step-24/664446 "2024-01-15T19:26:32Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![Addel-Ali](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/addel-ali/32/349263_2.png) [@Addel-Ali](https://forum.freecodecamp.org/u/Addel-Ali)\ **Post date:** [January 15, 2024, 7:26pm UTC](https://forum.freecodecamp.org/t/learn-basic-oop-by-building-a-shopping-cart-step-24/664446/1 "2024-01-15T19:26:32Z")
### Tell us what’s happening: ```auto totalCountPerProduct[dessert.id] = (totalCountPerProduct[dessert.id])+1 || 0; }); ``` I just need to know what I did wrong, so that the challange is not being passed ### Your code so far WARNING The challenge seed code and/or your solution exceeded the maximum length we can port over from the challenge. You will need to take an additional step here so the code you wrote presents in an easy to read format. Please copy/paste all the editor code showing in the challenge from where you just linked. ````plaintext Replace these two sentences with your copied code. Please leave the ``` line above and the ``` line below, because they allow your code to properly format in the post. ```` ### Your browser information: User Agent is: `Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36` ### Challenge Information: Learn Basic OOP by Building a Shopping Cart - Step 24 > **[freeCodeCamp.org](https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures-v8/learn-basic-oop-by-building-a-shopping-cart/step-24)** > > Learn to Code — For Free ---
**Author:** ![bbsmooth](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/bbsmooth/32/203556_2.png) [@bbsmooth](https://forum.freecodecamp.org/u/bbsmooth)\ **Post date:** [January 15, 2024, 7:30pm UTC](https://forum.freecodecamp.org/t/learn-basic-oop-by-building-a-shopping-cart-step-24/664446/2 "2024-01-15T19:30:43Z")
I’ve edited your code for readability. When you enter a code block into a forum post, please precede it with a separate line of three backticks and follow it with a separate line of three backticks to make it easier to read. You can also use the “preformatted text” tool in the editor (``) to add backticks around text. ![Pre-formatted-text](https://global.discourse-cdn.com/freecodecamp/original/3X/1/b/1b18854f1059217f29370444396145cc3a0cd8ae.gif) See [this post](https://forum.freecodecamp.org/t/forum-code-formatting/25574) to find the backtick on your keyboard. **Note:** Backticks (`) are not single quotes ('). ---
**Author:** ![bbsmooth](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/bbsmooth/32/203556_2.png) [@bbsmooth](https://forum.freecodecamp.org/u/bbsmooth)\ **Post date:** [January 15, 2024, 7:36pm UTC](https://forum.freecodecamp.org/t/learn-basic-oop-by-building-a-shopping-cart-step-24/664446/3 "2024-01-15T19:36:59Z")
The hint I am getting for your code above is: “You should wrap your right-hand `totalCountPerProduct[data.id]` in parentheses.” Which is not useful as you are already wrapping `totalCountPerProduct[data.id]` in parentheses. So I can understand your confusion. The problem you are trying to solve here is that `totalCountPerProduct[data.id]` could be `undefined`, and so in that case you want to use the value `0` instead. So inside the parentheses you either want to use the value of `totalCountPerProduct[data.id]` if it isn’t `undefined` **OR** the value `0`. Hopefully that gives you enough of a hint as to how to solve this. ---
**Author:** ![Addel-Ali](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/addel-ali/32/349263_2.png) [@Addel-Ali](https://forum.freecodecamp.org/u/Addel-Ali)\ **Post date:** [January 16, 2024, 4:37am UTC](https://forum.freecodecamp.org/t/learn-basic-oop-by-building-a-shopping-cart-step-24/664446/4 "2024-01-16T04:37:11Z")
Thanks for your help ---
**Author:** ![Addel-Ali](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/addel-ali/32/349263_2.png) [@Addel-Ali](https://forum.freecodecamp.org/u/Addel-Ali)\ **Post date:** [January 16, 2024, 4:38am UTC](https://forum.freecodecamp.org/t/learn-basic-oop-by-building-a-shopping-cart-step-24/664446/5 "2024-01-16T04:38:12Z")
Still not getting it, what is the right(correct) syntax ? ---
**Author:** ![bbsmooth](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/bbsmooth/32/203556_2.png) [@bbsmooth](https://forum.freecodecamp.org/u/bbsmooth)\ **Post date:** [January 16, 2024, 4:39am UTC](https://forum.freecodecamp.org/t/learn-basic-oop-by-building-a-shopping-cart-step-24/664446/6 "2024-01-16T04:39:55Z")
Can you paste your updated code in here so we can see what you did? Remember to use the method outlined above to paste it in here properly. ---
**Author:** ![Addel-Ali](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/addel-ali/32/349263_2.png) [@Addel-Ali](https://forum.freecodecamp.org/u/Addel-Ali)\ **Post date:** [January 16, 2024, 4:45am UTC](https://forum.freecodecamp.org/t/learn-basic-oop-by-building-a-shopping-cart-step-24/664446/7 "2024-01-16T04:45:23Z")
Matter of fact, I already solved the challange, understood that I had to state both facts and complete the expression. Thanks your help ---
**Author:** ![klinzzyy](https://sea3.discourse-cdn.com/freecodecamp/user_avatar/forum.freecodecamp.org/klinzzyy/32/352549_2.png) [@klinzzyy](https://forum.freecodecamp.org/u/klinzzyy)\ **Post date:** [February 9, 2024, 7:12pm UTC](https://forum.freecodecamp.org/t/learn-basic-oop-by-building-a-shopping-cart-step-24/664446/8 "2024-02-09T19:12:01Z")
You’ve saved my mental health lol, thank you ---
**Author:** ![system](https://global.discourse-cdn.com/freecodecamp/original/3X/e/1/e1c433102e34b46dfaa3e15d13ab9a514b127078.svg) [@system](https://forum.freecodecamp.org/u/system)\ **Post date:** [August 10, 2024, 7:12am UTC](https://forum.freecodecamp.org/t/learn-basic-oop-by-building-a-shopping-cart-step-24/664446/9 "2024-08-10T07:12:19Z")
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