fold

Start with current value zero and then apply the current and next value to the given function. When upstream completes, the current value is emitted downstream.

Simple operators

Signature

def fold[T](zero: T)(f: (T, Out) => T): Repr[T]

Description

Start with current value zero and then apply the current and next value to the given function. When upstream completes, the current value is emitted downstream.

Note that the zero value must be immutable.

emits when upstream completes

backpressures when downstream backpressures

completes when upstream completes