Every element has an index number. Key facts about JavaScript arrays: - They hold mixed data types like numbers, strings, and booleans. - They grow automatically. You do not need to set a size first.

I found the code of the "future" in a corner of GitHub. GUI (Graphical User Interface). Mouse operation. Window system. MVC (Model-View-Controller). Integrated Development Environment. Refactoring.

JavaScript compares objects by reference, not by content. Even if two arrays look identical, they live in different memory locations. The Map sees them as different keys. Here are three ways to solve ...