[go-nuts] The go way to compare values against an enum

[Sankar]

Hi,

I have the following Go type.

```
type weekday string

const (
  Monday weekday = "Monday"
  Tuesday = "Tuesday"
  .
  .
  .
)
```

Now I have a function that receives a string parameter and I want to 
evaluate if it s a valid weekday or not. Say:

```
func handler(w http.ResponseWriter, r *http.Request) {

// Parse req.body and get a day string

day := "Tuesday" // Valid day
day := "tuesday" // Invalid day
day := "123819283" // Invalid day

}
```

I want to evaluate if the string variable `day` is one of the valid 
permitted values for the [Ww]eekday custom type. What is the recommended / 
right go way of doing this ?

Thanks.

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