lib.assertOneOf

Specialized assertMsg for checking if val is one of the elements of the list xs. Useful for checking enums.

Inputs

name

The name of the variable the user entered val into, for inclusion in the error message

val

The value of what the user provided, to be compared against the values in xs

xs

The list of valid values

Type

assertOneOf :: String -> ComparableVal -> List ComparableVal -> Bool

Examples

let sslLibrary = "libressl";
in assertOneOf "sslLibrary" sslLibrary [ "openssl" "bearssl" ]
stderr> error: sslLibrary must be one of [
stderr>   "openssl"
stderr>   "bearssl"
stderr> ], but is: "libressl"

Noogle detected

• lib.asserts.assertOneOf

assertOneOf =
    name: val: xs:
    assertMsg (lib.elem val xs) "${name} must be one of ${lib.generators.toPretty { } xs}, but is: ${
      lib.generators.toPretty { } val
    }";