Hi,
At Kotlin Programming: The Big Nerd Ranch Guide, 2nd Ed (i-programmer.info), the book description is “Based on Big Nerd Ranch’s popular Kotlin Essentials course, and written for Kotlin 1.4, in this guide…”
But in another place (say, Kotlin Programming: The Big Nerd Ranch Guide, 2nd Edition | InformIT), the book description is “Written for Kotlin 1.5, this book will also introduce you to JetBrains’ …”
I am literally confused, does 2nd edition teach up to 1.4 or 1.5?