RxSwift: Reduce Operator

.reduce (_:_:)

• Sequentially applies a function to each element emitted by an Observable.
• Also known as an “accumulator” / “aggregate” operator.
• Take the element emitted from an Observable and passes this along as the result of the function until the Observable ends where it then emits the final resulting value.

----9-----2-----1-------3------|----->

reduce((x, y) => x-y)

-------------------------------3----->

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