The Laravel News site has posted a book review by Diaa Fares of Adam Wathan's "Refactoring to Collections" book.

“Never write another loop again.” A strong promo sentence used by Adam Wathan to market his Refactoring to Collections book, but does it hold the promise? Well, together we will explore how close that claim is to reality.

If you are a Laravel developer, chances are you’ve heard about the collection pipeline before. While I use it a little in my projects I hadn’t realized the possibilities of this approach until I read Refactoring to Collections. It brought me to another level of thinking about utilizing the power and capabilities of functional programming.

The review goes on to talk about imperative versus declarative programming (with examples) and how the book walks you through "the journey" to move to a collections-driven code structure. The review also points out the amount of concepts to learn in the book and the style/effort that was clearly put into its creation. It also points to this RFC as hope for the native use of "arrow functions" in PHP in the future.