How to Count Unique Items in JavaScript Arrays

[Dave Johnson]

In this article, I explore how to count unique items in JavaScript arrays, specifically in the context of an IoT project for tracking fish feeding times using various buttons. By reading a log file and creating a JavaScript array of button sources, I demonstrate methods to retrieve distinct elements and count their occurrences using techniques like forEach, reduce, and the Set object. Additionally, I provide alternative command-line solutions for achieving similar results in a Linux environment. Ultimately, the flexibility of JavaScript allows for multiple approaches to effectively count distinct elements, enhancing our understanding of array manipulation.