![]() Either forkJoin or zip will work and return the same result because API calls are one-time only, auto-completed once result is returned (e.g. One of the most common use cases of combination operators would be calling a few APIs, wait for all results return, then executing next logic. In some cases, the outcome of using different operators might be the same (that’s why people get confused on which one to use), it would be good to understand the intention of the operator & decide accordingly. In summary, these four operators trigger the next action (subscribe function in our case) in slightly different conditions. With the above change, you should see a white shirt with fish: complete() (as previous code) because take and first will auto-complete the observable when the is condition met. You can remove all the code in part 5 as well. Logo represent two observables in our code - color$ and logo$. You will need to wait and combine these two pieces of information continuously in order to print t-shirts. Both of them will pick color and logo spontaneously. ![]() Color holds the color information, and Mr. This article will talk about the usage and differences between these four operators, so you know which one to use when the time comes. These four operators are what we know as combination operators - we use them when we need to join information from multiple observables. If you are confused about the differences between forkJoin, zip, combineLatest, and withLatestFrom, you are not alone.
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