Closed
Description
With the addition of SequencedCollection in Java 21, List supports methods getFirst() and getLast().
Similarly, I think 'ListOperations' in 'RedisTemplate' could be improved by introducing a method like getFirst(key) instead of index(key, 0).
How about add methods like the code I wrote below?
/**
* Returns the first element from list at {@code key}.
*
* @implSpec
* The implementation in this interface returns the result of calling {@code index(key, 0)}.
*
* @param key must not be {@literal null}.
* @return {@literal null} when used in pipeline / transaction.
*/
@Nullable
default V getFirst(K key) {
return index(key, 0);
}
/**
* Returns the last element from list at {@code key}.
*
* @implSpec
* If the result of calling {@code size(key)} is not null, The implementation in this interface returns the
* result of calling {@code index(key, size - 1)}. Otherwise, it returns null.
*
* @param key must not be {@literal null}.
* @return {@literal null} when used in pipeline / transaction.
*/
@Nullable
default V getLast(K key) {
Long size = size(key);
return size != null ? index(key, size - 1) : null;
}