[ifross]

In the preface it does state:

  To run the examples, you will need at least version 1.5 of Go.

  $ go version
  go version go1.5 linux/amd64

  Follow the instructions at https://golang.org/doc/install if the go tool on your computer is older or missing.

[morsegeek]

The deterministic rand behavior is the same for all go versions: https://golang.org/pkg/math/rand/#pkg-overview