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os: Add example for Expand function.

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Change-Id: I581492c29158e57ca2f98b75f47870791965a7ff
Reviewed-on: https://go-review.googlesource.com/81155
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
azat 2017-11-30 22:32:39 +03:00 committed by Brad Fitzpatrick
parent 67fe8b5677
commit ef99381676
1 changed files with 18 additions and 0 deletions
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18
src/os/example_test.go
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@ -82,6 +82,24 @@ func init() {
os.Unsetenv("GOPATH")
}
func ExampleExpand() {
mapper := func(placeholderName string) string {
switch placeholderName {
case "DAY_PART":
return "morning"
case "USER":
return "Gopher"
}
return ""
}
fmt.Println(os.Expand("Good ${DAY_PART}, $USER!", mapper))
// Output:
// Good morning, Gopher!
}
func ExampleExpandEnv() {
fmt.Println(os.ExpandEnv("$USER lives in ${HOME}."))