There's a section called A Tour of Go [0] which has a series of code samples with explanations. The last part of the introduction to the tour says a little abou

There's a section called A Tour of Go [0] which has a series of code samples with explanations. The last part of the introduction to the tour says a little about what they call the Go playground [1]: "This tour is built atop the Go Playground, a web service that runs on golang.org's servers. The service receives a Go program, compiles, links, and runs the program inside a sandbox, then returns the output." [0] - https://tour.golang.org/welcome/1 https://tour.golang.org/welcome/1 [1] - https://tour.golang.org/welcome/4 https://tour.golang.org/welcome/4