Hands-On Functional Programming with TypeScript

Cold and hot observables

The official RxJS documentation explores the differences between cold and hot observables as follows:

"Cold observables start running upon subscription, that is, the observable sequence only starts pushing values to the observers when Subscribe is called. Values are also not shared among subscribers. This is different from hot observables, such as mouse move events or stock tickers, which are already producing values even before a subscription is active. When an observer subscribes to a hot observable sequence, it will get all values in the stream that are emitted after it subscribes. The hot observable sequence is shared among all subscribers, and each subscriber is pushed the next value in the sequence."

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