💥 Reactive Angular - The Single Data Observable Pattern

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combineLatest actually waits for all input Observables to emit at least once, before it starts emitting results.
So in this example the html will only be populated once both courses and lessons have been fetched.
You can use the startWith operator on course$ and lessons$ to overcome this.

brampeirsful
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This video is published in that time when i was stuck on the similar logic on my work. Thank you!

clucky
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Thanks, very useful and simple pattern

santigarciallorente
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I do a pattern very similar to this one, it's super sweet.

StephenMoreira
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okay but your endpoint /courses/id could just retrieves the course with a an array of its lessons and you don't need to combine two observables.

knful