Software development and programming has advanced quite a lot in the past decade. Many concepts that were previously considered academic and inefficient are beginning to find a place among modern software solutions. Two such concepts are coroutines (goroutines in Go) and channels. Conceptually, they have evolved over time and they have been implemented differently in each programming language. In many programming languages such as Ruby or Clojure, they are implemented as libraries, but in Go, they are implemented within the language as a native feature. As we shall see, this makes the language really modern, quite efficient, and an advanced programming language.