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text/template: add an if func example #71922

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text/template: add an if func example #71922

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25 changes: 25 additions & 0 deletions src/text/template/examplefunc_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -96,3 +96,28 @@ func ExampleTemplate_funcs() {
// def
// def
}

// This example demonstrates how to use "if".
func ExampleTemplate_if() {
type book struct {
Stars float32
Name string
}

tpl, err := template.New("book").Parse(`{{ if (gt .Stars 4.0) }}"{{.Name }}" is a great book.{{ else }}"{{.Name}}" is not a great book.{{ end }}`)
if err != nil {
log.Fatalf("failed to parse template: %s", err)
}

b := &book{
Stars: 4.9,
Name: "Good Night, Gopher",
}
err = tpl.Execute(os.Stdout, b)
if err != nil {
log.Fatalf("failed to execute template: %s", err)
}

// Output:
// "Good Night, Gopher" is a great book.
}