putIfAbsent method Null safety

  1. @override
Future<bool> putIfAbsent(
  1. String key,
  2. T value,
  3. {CacheEntryDelegate<T>? delegate}

Associates the specified key with the given value if not already associated with a value.

  • key: key with which the specified value is to be associated
  • value: value to be associated with the specified key
  • delegate: provides the caller a way of changing the CacheEntry before persistence

Returns true if a value was set.


Future<bool> putIfAbsent(String key, T value,
    {CacheEntryDelegate<T>? delegate});