Here is the link for the course:
https://www.educative.io/courses/decode-coding-interview-js
If possible please also look for below courses in the order given. Some of these are available in other languages like C++ and Java in one of the hacksnation links here
https://www.educative.io/courses/data-structures-coding-interviews-javascript
https://www.educative.io/courses/javascript-design-patterns-for-coding-interviews
If the above javascript ones are not available then below python of courses also would help as alternative.
https://www.educative.io/courses/algorithms-coding-interviews-python
https://www.educative.io/courses/data-structures-coding-interviews-python
https://www.educative.io/courses/coderust-hacking-the-coding-interview in javascript or python
https://www.educative.io/profile/view/5668639101419520 A few courses from here and the coding ones in javascript or python
Please let me know if you need more information.
