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In the future, Variable will be deprecated in RxSwift 4. Instead, Relay classes were first implemented in RxCocoa 4, and an alternate proposed to Variable is BehaviorRelay.

Assigning the value of a Variable is an imperative programming-style command. Its convenient but not belongs in Reactive’s declarative programming environment.

What are their pros and cons?

Yi-shen Chen
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I recommend you read this post (or maybe all thread) to find out some user-friendly explanation about Variable and Driver.

pacification
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