package main
import (
"log"
"math"
"os"
"text/template"
)
const tmplStr = `{{range . -}}
{{printf "%- 16s" .Name}} is: {{if .Value}}true{{else}}false{{end}}
{{end}}`
func main() {
t := template.Must(template.New("if").Parse(tmplStr))
var nilPtr *string = nil
var nilSlice []float32
emptySlice := []int{}
data := []struct {
Name string
Value interface{}
}{
{"bool false", false},
{"bool true", true},
{"integer 0", 0},
{"integer 1", 1},
{"float32 0", float32(0)},
{"float64 NaN", math.NaN},
{"empty string", ""},
{"non-empty string", "haha"},
{"nil slice", nilSlice},
{"empty slice", emptySlice},
{"non-empty slice", []int{3}},
{"nil pointer", nilPtr},
}
err := t.Execute(os.Stdout, data)
if err != nil {
log.Fatalf("t.Execute() failed with '%s'\n", err)
}
}
