js-methods | JavaScript prototype extensions the browser | Runtime Evironment library
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kandi X-RAY | js-methods Summary
JavaScript prototype extensions for the browser or for Node.js
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QUESTION
So the code below has been developed off the answer I got in this stack overflow question.
the code is designed to poll my server until either a condition on the server is true, or polling has occurred for a minute.
I understand I can stop the polling after a minute using the takeUntil
RXJS function. However, I have no idea where in the code I would put it in. As every place I put it in that I thought it would go, the code has errored out.
I am also using this tutorial from the learnrxjs website https://www.learnrxjs.io/learn-rxjs/operators/filtering/takeuntil
You'll notice the first line of the startastream()
function is
const endtimer = timer(60000);
This is the condition that would fill the takeUntil()
argument. So takeUntil(endtimer)
ANSWER
Answered 2021-Mar-09 at 01:00You can simply place it in the pipe after switchMap:
QUESTION
we have an REST-API that is frontend agnostic, which means that it always sends the IRI to its nested resources. So to retrieve some data you always have to make multiple http calls (first get the parent resource, then its child resources etc.) So each Country has a list of linked Entries. Each entry is linked to a product, which has a IRI to its category resource.
...ANSWER
Answered 2020-Jul-10 at 15:58not sure if this can be helpful, i combinated the requests with rxjs operators.
QUESTION
I'm a bit confused about async functions. It says that they return a promise. A promise usually does not immediately run before the rest of the code, because javascript works with the "run to completion" approach.
But if async functions return a promise, how can you explain this?
...ANSWER
Answered 2019-Dec-09 at 17:15But if async functions return a promise, how can you explain this?
An async
function runs synchronously up to the first await
or return
(including implicit return). (When I say "up to," the synchronous part includes the operand to the right of await
or return
.) At that point (await
or return
), it returns a promise. That's so it can start whatever asynchronous process it's supposed to start. This is covered in the specification here.
Your _prefixJS
doesn't contain any await
or return
, so it synchronously runs through to the end, returning a promise that will be fulfilled with the value undefined
.
To make your async
function actually work asynchronously, you'd want to use the fs.promises
version of those functions and await
their results. Something like this (untested):
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