func (f Float64Option) ApplyNamed(set *flags.Set) { if f.EnvVar != "" { if envVal := os.Getenv(f.EnvVar); envVal != "" { envValFloat, err := strconv.ParseFloat(envVal, 10) if err == nil { f.Value = float64(envValFloat) } } } eachName(f.Name, func(name string) { set.Float64(name, f.Value, f.Usage, f.Var, f.Optional) }) }