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JavaScript has been in the business for more than 25 years, it is still considered one of the most complicated programming languages. There are so many concepts in this language that it is not easy to become a JavaScript developer. Solving expert-level JavaScript coding challenges is even tougher. In this article, we will list the top 3 expert level coding challenges for JavaScript developers. The most focussed ones are arrays, strings, matrices, and other important topics discussed in this article are objects, such as numbers, functions, and dates.