I noticed that there is a outdated url at this lesson which points out to another exercise. The lesson is Call and Response.
Remember when we mentioned that symbols are awesome for referencing method names? Well,
.respond_to?takes a symbol and returns
trueif an object can receive that method and
The “mentioned” url points out to the main Ruby course page with a message saying that Ruby is no longer supported and try instead Learn Ruby path (which I am doing currently).