# Code.org is using their own library right? For instance setProperty() is a custom function? **URL:** \ **Category:** Coding and Debugging Help\ **Created:** [October 24, 2022, 12:05pm UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107 "2022-10-24T12:05:07Z")\ **Posts on this page:** 10\ **Page:** 1
**Author:** ![tuckt123](https://avatars.discourse-cdn.com/v4/letter/t/3ec8ea/32.png) [@tuckt123](https://forum.code.org/u/tuckt123)\ **Post date:** [October 24, 2022, 12:05pm UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107/1 "2022-10-24T12:05:07Z")
I am learning JS separately and was confused to run into setProperty(). Is that a custom property that [code.org](http://code.org) has created for the students? I wish they would state this because I would like to differentiate between whats vanilla JS and a library they use. For instance, console.log() is vanilla JS, but they dont really differentiate. Im actually more confused because you need to use dot notation when using setProperty I believe. MDN: [CSSStyleDeclaration.setProperty() - Web APIs | MDN](https://developer.mozilla.org/en-US/docs/Web/API/CSSStyleDeclaration/setProperty) ---
**Author:** ![wutadam](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/wutadam/32/7711_2.png) [@wutadam](https://forum.code.org/u/wutadam)\ **Post date:** [October 24, 2022, 12:07pm UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107/2 "2022-10-24T12:07:33Z")
[Code.org](http://Code.org) uses its own interpreter for the App Lab and Game Lab platforms. If you’d like to use vanilla JS, use [Glitch.com](http://Glitch.com), [Replit.com](http://Replit.com), or [Sololearn.com](http://Sololearn.com). ---
**Author:** ![tuckt123](https://avatars.discourse-cdn.com/v4/letter/t/3ec8ea/32.png) [@tuckt123](https://forum.code.org/u/tuckt123)\ **Post date:** [October 24, 2022, 12:15pm UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107/3 "2022-10-24T12:15:33Z")
So they use a custom interpreter or library? For instance, in [code.org](http://code.org) there is a setScreen(). Is that considered a “function” that is from a [code.org](http://code.org) library? Or is that something else, I just dont know how to contextualize this to students. ---
**Author:** ![wutadam](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/wutadam/32/7711_2.png) [@wutadam](https://forum.code.org/u/wutadam)\ **Post date:** [October 24, 2022, 12:17pm UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107/4 "2022-10-24T12:17:20Z")
I just call it a built-in function, since it is, well, a function. ---
**Author:** ![letti42](https://avatars.discourse-cdn.com/v4/letter/l/7ea924/32.png) [@letti42](https://forum.code.org/u/letti42)\ **Post date:** [October 24, 2022, 6:57pm UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107/5 "2022-10-24T18:57:59Z")
It’s an interpreter. You write code that [code.org](http://code.org) translates into javascript to run. Libraries add on to the already existing code, such as jQuery in regular javascript - all it does is make some of the functions that previously exist more understandable, or easier to read. tldr; interpreter: translates code, libraries: add onto code ---
**Author:** ![tuckt123](https://avatars.discourse-cdn.com/v4/letter/t/3ec8ea/32.png) [@tuckt123](https://forum.code.org/u/tuckt123)\ **Post date:** [October 25, 2022, 11:00am UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107/6 "2022-10-25T11:00:27Z")
Everyone is saying this. However, an interpreter in other aspects of computer science translates code into machine code, not into a higher-level language usually. Does [code.org](http://code.org) have documentation for this or anything? ---
**Author:** ![wutadam](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/wutadam/32/7711_2.png) [@wutadam](https://forum.code.org/u/wutadam)\ **Post date:** [October 25, 2022, 2:11pm UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107/7 "2022-10-25T14:11:56Z")
[Code.org](http://Code.org) doesn’t have its own documentation, but I’ve seen people somewhere else say that [code.org](http://code.org) is around 400x slower than vanilla JavaScript since it runs on its own interpreter. ---
**Author:** ![jdonwells](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/jdonwells/32/7900_2.png) [@jdonwells](https://forum.code.org/u/jdonwells)\ **Post date:** [October 25, 2022, 5:16pm UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107/8 "2022-10-25T17:16:40Z")
Don’t exaggerate. It is 200x slower. ---
**Author:** ![wutadam](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/wutadam/32/7711_2.png) [@wutadam](https://forum.code.org/u/wutadam)\ **Post date:** [October 25, 2022, 5:21pm UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107/9 "2022-10-25T17:21:03Z")
Jeez, sorry. I didn’t know the exact number. ---
**Author:** ![jdonwells](https://sea2.discourse-cdn.com/flex016/user_avatar/forum.code.org/jdonwells/32/7900_2.png) [@jdonwells](https://forum.code.org/u/jdonwells)\ **Post date:** [October 25, 2022, 5:32pm UTC](https://forum.code.org/t/code-org-is-using-their-own-library-right-for-instance-setproperty-is-a-custom-function/37107/10 "2022-10-25T17:32:54Z")
Just kidding. But the guy who wrote the interpreter says 200x.