Grouping<T, K> class

Serves as an step between grouping and folding operations.

It groups elements by their key and then allows you to fold each group with some aggregating operation.

To get an instance use the GroupingBy extension method.

Properties

group → Map<K, List<T>>

final

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

sourceIterator → Iterator<T>

Returns a new Iterator for the source of this grouping.

no setter

Methods

aggregate<R>(AggregateOperation<T, K, R> operation) → Map<K, R>

For each group the operation is applied to the elements of that group sequentially.

aggregateTo<R>(Map<K, R> destination, AggregateOperation<T, K, R> operation) → Map<K, R>

For each group the operation is applied to the elements of that group sequentially.

eachCount() → Map<K, int>

Groups elements by key and counts the elements in each group.

eachCountTo(Map<K, int> destination) → Map<K, int>

Groups elements by key and counts the elements in each group to the given map.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

override

Operators

operator ==(Object other) → bool

The equality operator.

inherited

operator [](T element) → K?