November 2019
Beginner
804 pages
20h 1m
English
Content preview from Learn TypeScript 3 by Building Web Applications
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RxJS basics − hot and cold observables
Observables can be hot or cold.
Cold observables start executing upon subscription (that is, they only start producing values when subscribe is called). You can compare cold observables to online video streaming solutions: that is, they only stream data when a client is connected and requests it.
Hot observables are different—they produce values whether there are subscribers or not. You can compare hot observables to a radio: it keeps streaming, hoping that there are listeners out there.
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