whenExist<T> method

T? whenExist<T>(
  1. Map<String, T?> m
)
inherited

当某个Key存在

Implementation

T? whenExist<T>(Map<String, T?> m) {
  for (var k in m.keys) {
    if (hasAttr(k)) {
      return m[k]!;
    }
  }
  return null;
}