grouping
RU: группировка
A hash-map pattern where the value is a list (not a count): for each item, compute a group key, then append the item to the list under that key. Items that share a property compute the same key and land in the same bucket.
RU: группировка
A hash-map pattern where the value is a list (not a count): for each item, compute a group key, then append the item to the list under that key. Items that share a property compute the same key and land in the same bucket.