Built-in JavaScript objects and functions are ones you'll use all the time. Here's how to use Object, JSON, String, Math, Date, and console in your JavaScript programs.

join() - The join() method in JavaScript is used to join the elements of an array into a string. It takes an array and concatenates its elements into a single string..toString() - In JavaScript, the ...

As an aside, note that the Intl.ListFormat() JavaScript object makes it easy to add “and” before the last item in a comma-separated array-to-string. So, the code ...