RxSwift: Hot vs Cold Observable

Hot Observable

• A “hot” Observable begins emitting elements immediately and before it is subscribed to.
• Any observer who later subscribes to a “hot” Observable may start observing the sequence anywhere in the middle.

Cold Observable

• A “cold” Observable begins emitting elements only when it is subscribed to.
• A subscriber of a “cold” Observable is guaranteed to see the whole sequence from the beginning.

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