Function load_var_with_default 

pub fn load_var_with_default<T: FromStr, S: BuildHasher>(
    var_name: &'static str,
    hashmap: Option<&HashMap<String, String, S>>,
    default: &'static str,
) -> Result<T, Error>

Tries to load an environment variable by name and parse it into type T. If the environment variable is not present, it returns a default value.

This function can also use a hashmap as a fallback or for testing purposes.

Errors

• Parsing failed