TransformingFunction<I, O> class abstract

Transforming operation that produces at least one value for each original value.

class StringTransforming extends TransformingFunction<int, String> {
  @override
  Iterable<String> onValue(int value) sync* {
    yield value.toString();
  }
}

void main() async {
  final Stream<int> stream = Stream
    .fromIterable([1, 7, 2, 5])
    .transform(StringTransforming());

  final List<String> values = await stream.toList();
  print(values);   // ["1", "7", "2", "5"]
}

Inheritance

• Object
• StreamTransformerBase<I, O>
• TransformingFunction

Implementers

• TransformingUnaryOperator

Constructors

TransformingFunction()

TransformingFunction.parameter(Iterable<O> onValue(I))

factory

Properties

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

Methods

bind(Stream<I> stream) → Stream<O>

Transforms the provided stream.

override

cast<RS, RT>() → StreamTransformer<RS, RT>

Provides a StreamTransformer<RS, RT> view of this stream transformer.

inherited

dispose() → Future<void>

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

onValue(I value) → Iterable<O>

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited