Circular dependencies in JavaScript can lead to issues such as unexpected behaviors and difficulties in debugging. The article explores the causes and consequences of circular dependencies, as well as strategies to identify and resolve them effectively. Understanding these dependencies is crucial for maintaining clean and efficient code in JavaScript applications.

The article discusses the concept of "useless use of callbacks," which refers to unnecessary use of callbacks in programming, particularly in JavaScript. It highlights how this practice can lead to more complex and less maintainable code, advocating for more straightforward alternatives.

The article critiques the use of the JavaScript `String.prototype.slice` method, arguing that it can lead to confusion and bugs due to its behavior with negative indices. It suggests alternative string manipulation methods that can provide clearer and more predictable results for developers.