tour: rand.Seed suggestion does not work

[brianshumate]

Context: https://tour.golang.org/basics/1

I wanted to get a different number each time from this example, so I took the suggestion to seed the number generator.

Here is my code:

package main

import (
    "fmt"
    "math/rand"
    "time"
)

func main() {
    rand.Seed(time.Now().UTC().UnixNano())
    fmt.Println("My favorite number is", rand.Intn(9001))
}

When I execute the above code in the tour, the same number is returned every time as if seeding the number generator has no effect.

When I execute this code locally (go version go1.6.2 darwin/amd64) it returns a different number each time as expected.

[adg]

From the page you linked:

Note: the environment in which these programs are executed is deterministic, so each time you run the example program rand.Intn will return the same number. (To see a different number, seed the number generator; see rand.Seed.)

[adg]

We should probably mention that you need to seed it with something that is not the time. The time is always the same in the playground.

[humblec]

This is not good :( , it confuse lots of people. If the time is kept constant, it has to be notified somehow to an end user or at least when they use "time" package in playground.

[robphoenix]

https://go-review.googlesource.com/c/44931/ @adg