Learning Functional Programming in Go

The cd command to project root directory

Before using dot init, you might see invalid settings for GOROOT, GOPATH, and GOBIN:

The * on the last line of output in the preceding screenshot indicates that our Go version is set to version 1.8.3. Note that running go version  returns  go1.9 darwin/amd64, which was the most recent version of Go when our book was published. We see that our GOPATH is not properly set and that we have three versions of Go installed.