containsKey method

FieldValidator<T, Map<TKey, TValue>> containsKey(
  1. TKey key, [
  2. MessageCallBack<Map<TKey, TValue>>? message
])

check if the value contains key

Implementation

FieldValidator<T, Map<TKey, TValue>> containsKey(TKey key,
    [MessageCallBack<Map<TKey, TValue>>? message]) {
  return containsKeyFn(() => key, message);
}