ScanStreamTransformer<S, T> class

Applies an accumulator function over an stream sequence and returns each intermediate result. The optional seed value is used as the initial accumulator value.

Example

Stream.fromIterable([1, 2, 3])
   .transform(ScanStreamTransformer((acc, curr, i) => acc + curr, 0))
   .listen(print); // prints 1, 3, 6
Inheritance

Constructors

ScanStreamTransformer(T accumulator(T accumulated, S value, int index), [T seed])
Constructs a ScanStreamTransformer which applies an accumulator Function over the source Stream and returns each intermediate result. The optional seed value is used as the initial accumulator value.

Properties

accumulator → T Function(T accumulated, S value, int index)
Method which accumulates incoming event into a single, accumulated object
final
hashCode int
The hash code for this object. [...]
read-only, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
seed → T
The initial value for the accumulated value in the accumulator
final

Methods

bind(Stream<S> stream) Stream<T>
Transforms the provided stream. [...]
override
cast<RS, RT>() StreamTransformer<RS, RT>
Provides a StreamTransformer<RS, RT> view of this stream transformer. [...]
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
inherited
toString() String
Returns a string representation of this object.
inherited

Operators

operator ==(Object other) bool
The equality operator. [...]
inherited