Insight: Basically what we get with Lenses is to reuse the data access of a structure in a modular and immutable way, either to obtain the data or to modify it. Also, with the composition of Lenses we will be able to reach the most profound data within our structure in a simpler way.

Insight: Despite being widely used today, Webpack is still a black box for many developers who simply use an existing configuration without knowing how it really works. Using Webpack modules we can divide our code into different files, so that each file has a single responsibility, which will make our code much more understandable and easy to test.

Insight: Functional programming becomes critical when the focus is the ultimate result — what to solve rather than how to solve it. Functional programming leads to a more transparent, cleaner code that helps the user in debugging and maintenance, and is fast becoming the go-to method for developers.