export enum OneOfErrorCode {
    NOT_ONE_OF = "NOT_ONE_OF"
}

export function checkOneOf<T> (mixed : any, arr : T[]) : undefined|OneOfErrorCode {
    for (let item of arr) {
        if (mixed === item) {
            return undefined;
        }
    }
    return OneOfErrorCode.NOT_ONE_OF;
}

export enum NotOneOfErrorCode {
    IS_ONE_OF = "IS_ONE_OF"
}

export function checkNotOneOf<T, NotT extends T> (mixed : any, arr : NotT[]) : undefined|NotOneOfErrorCode {
    for (let item of arr) {
        if (mixed === item) {
            return NotOneOfErrorCode.IS_ONE_OF;
        }
    }
    return undefined;
}