Grouping data topic

Group discrete values.

Functions

group<T, K>(Iterable<T> iterable, K key(T)) → Map<K, List<T>> Grouping data
Groups the specified iterable of values into an Map from key to list of value.
group<T, K>(Iterable<T> iterable, K key(T)) → Map<K, List<T>> Grouping data
Groups the specified iterable of values into an Map from key to list of value.
group<T, K>(Iterable<T> iterable, K key(T)) → Map<K, List<T>> Grouping data
Groups the specified iterable of values into an Map from key to list of value.
groupSort<T, K>(Iterable<T> iterable, K key(T), [num valueComparator(List<T>, List<T>) = ascending, num keyComparator(K, K) = ascending]) → List<K> Grouping data
Groups the specified iterable of elements according to the specified key function, sorts the groups according to the specified valueComparator for values and keyComparator for keys, and then returns a list of keys in sorted order.
groupSort<T, K>(Iterable<T> iterable, K key(T), [num valueComparator(List<T>, List<T>) = ascending, num keyComparator(K, K) = ascending]) → List<K> Grouping data
Groups the specified iterable of elements according to the specified key function, sorts the groups according to the specified valueComparator for values and keyComparator for keys, and then returns a list of keys in sorted order.
groupSort<T, K>(Iterable<T> iterable, K key(T), [num valueComparator(List<T>, List<T>) = ascending, num keyComparator(K, K) = ascending]) → List<K> Grouping data
Groups the specified iterable of elements according to the specified key function, sorts the groups according to the specified valueComparator for values and keyComparator for keys, and then returns a list of keys in sorted order.
index<T, K>(Iterable<T> iterable, K key(T)) → Map<K, List<T>> Grouping data
Equivalent to group but returns a unique value per compound key instead of an list, throwing if the key is not unique.
index<T, K>(Iterable<T> iterable, K key(T)) → Map<K, List<T>> Grouping data
Equivalent to group but returns a unique value per compound key instead of an list, throwing if the key is not unique.
index<T, K>(Iterable<T> iterable, K key(T)) → Map<K, List<T>> Grouping data
Equivalent to group but returns a unique value per compound key instead of an list, throwing if the key is not unique.
rollup<T, R, K>(Iterable<T> iterable, R reduce(List<T>), K key(T)) → Map<K, R> Grouping data
Groups and reduces the specified iterable of values into an Map from key to value.
rollup<T, R, K>(Iterable<T> iterable, R reduce(List<T>), K key(T)) → Map<K, R> Grouping data
Groups and reduces the specified iterable of values into an Map from key to value.
rollup<T, R, K>(Iterable<T> iterable, R reduce(List<T>), K key(T)) → Map<K, R> Grouping data
Groups and reduces the specified iterable of values into an Map from key to value.
rollupSort<T, R, K>(Iterable<T> iterable, R reduce(List<T>), K key(T), [num valueComparator(R, R) = ascending, num keyComparator(K, K) = ascending]) → List<K> Grouping data
Groups and reduces the specified iterable of elements according to the specified key function, sorts the reduced groups according to the specified valueComparator for values and keyComparator for keys, and then returns a list of keys in sorted order.
rollupSort<T, R, K>(Iterable<T> iterable, R reduce(List<T>), K key(T), [num valueComparator(R, R) = ascending, num keyComparator(K, K) = ascending]) → List<K> Grouping data
Groups and reduces the specified iterable of elements according to the specified key function, sorts the reduced groups according to the specified valueComparator for values and keyComparator for keys, and then returns a list of keys in sorted order.
rollupSort<T, R, K>(Iterable<T> iterable, R reduce(List<T>), K key(T), [num valueComparator(R, R) = ascending, num keyComparator(K, K) = ascending]) → List<K> Grouping data
Groups and reduces the specified iterable of elements according to the specified key function, sorts the reduced groups according to the specified valueComparator for values and keyComparator for keys, and then returns a list of keys in sorted order.