RxSwift: DistinctUntilChanged Operator

.distinctUntilChanged

• Prevents duplicate contiguous elements from getting through.
• The 2nd element in the sequence will not get through.
• Elements that are equatable can be compared or you can provide your own comparison.

Comes in 2 forms:

• .distinctUntilChanged()

• .distinctUntilChanged(_:)

• .distinctUntilChanged(_:) is useful when you want to distinctly prevent duplicates for type that do not conform to equatable:

.distinctUntilChanged { a, b in a.value == b.value }

----1--2-----2--4----4--2-----2--4---->

distinctUntilChanged

----1--2--------4-------2--------4---->

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