RxSwift: ReplaySubject

• Initialised with a buffer size and will maintain a buffer of elements up to that size and replay it to new subscribers.
• Useful when you want to show more than the latest value that a BehaviorSubject would provide.
• Will temporarily cache or buffer the latest elements it emits up to a specified size.
• Will then replay that buffer to new subscribers.
• Beware that buffer is stored in memory which may cause issues if using images. Large buffers may use up a lot of memory. Also, array will be emitted as such so watch for the size of image based arrays.
• Initialised using the type methods create(bufferSize:).

let subject = ReplaySubject<String>.create(bufferSuze: 8)

• ReplayMany is an internal type that is used to create replay subjects. May see this in an error message if you do not dispose of your ReplaySubject correctly.

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