Promise3 | Try to implement a Promise which compliance to promise A/ | Reactive Programming library

by xieranmaya JavaScript Version: v1.0.0 License: No License

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kandi X-RAY | Promise3 Summary

Promise3 is a JavaScript library typically used in Programming Style, Reactive Programming applications. Promise3 has no bugs, it has no vulnerabilities and it has low support. You can download it from GitHub.

Try to implement a Promise which compliance to promise A/+ Spec. It's my third implementation thus it's called Promise3.

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Support

Promise3 has a low active ecosystem.

It has 114 star(s) with 58 fork(s). There are 2 watchers for this library.

It had no major release in the last 12 months.

There are 4 open issues and 0 have been closed. There are 2 open pull requests and 0 closed requests.

It has a neutral sentiment in the developer community.

The latest version of Promise3 is v1.0.0

Quality

Promise3 has 0 bugs and 0 code smells.

Security

Promise3 has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.

Promise3 code analysis shows 0 unresolved vulnerabilities.

There are 0 security hotspots that need review.

License

Promise3 does not have a standard license declared.

Check the repository for any license declaration and review the terms closely.

Without a license, all rights are reserved, and you cannot use the library in your applications.

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Promise3 releases are available to install and integrate.

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Promise3 Key Features

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Promise3 Examples and Code Snippets

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Community Discussions

Trending Discussions on Promise3

Possible contradiction between Promises/A+ spec and ECMAScript promises?

Run multiple Promise.all() in Sequence (Reading the second Promise.all only after the first one is completed)

Does Promise.allSettled preserve the original order in the response in all scenarios?

when I learned about microtask and Promise , I came across a behavior I don't understand

Make multi API requests simultaneously

How exactly works this Promise.all() statement in my code?

undefined is not a promise

AWS Lambda returns 502 when using Promise.all()

Does Promise.all() run in sequential or parallel in Angular?

How to chain promises together in JavaScript

QUESTION

Possible contradiction between Promises/A+ spec and ECMAScript promises?

Asked 2021-May-26 at 20:29

It is asserted the ECMAScript promises is a Promises/A+ implementation, so they have no contradictions. However, I encountered a behaviour of ecma promises which allegedly is out of line with the Promises/A+.

When we call promise1.then(onFulfilled, onRejected) to listen to the promise1's output, we get as a return value another promise (promise2). When the needed callback (onFulfilled/onRejected) was executed and it, in turn, returned some value x, the spec prescribes to resolve it with the defined [[Resolve(promise2, x)]] function. Let's suppose x happened to be a promise itself (x === promise3), then the steps must be taken is the following:

If x is a promise, adopt its state:

If x is pending, promise2 must remain pending until x is fulfilled or rejected.

If/when x is fulfilled, fulfill promise2 with the same value.

If/when x is rejected, reject promise2 with the same reason.

I wonder what if x is finally fulfilled with yet another promise (promise4) (there are not anything in the way of it, are there?). It can be concluded from the spec excerpt that promise2 must be fulfilled with promise4 too. But it is seemingly not so in the ECMAScript world:

...

ANSWER

Answered 2021-May-26 at 20:29

Let's suppose x happened to be a promise itself, then the steps must be taken is the following: […]

No, they don't need to be taken - they only may be taken if x is a "promise". These steps are an optional ("allowed", not "required") optimisation:

Note 4:
Generally, it will only be known that x is a true promise if it comes from the current implementation. This clause allows the use of implementation-specific means to adopt the state of known-conformant promises.

ECMAScript does not treat its own Promises as "known to be conformant", ignoring these steps. They simply treat native promises like all other thenables. Given there is no way to create an ECMAScript Promise that is fulfilled with another promise, this is equivalent to directly adopting the state.

Source https://stackoverflow.com/questions/67708675

QUESTION

Run multiple Promise.all() in Sequence (Reading the second Promise.all only after the first one is completed)

Asked 2021-May-25 at 03:00

I want to run multiple Promise.all functions in sequence where the second Promise.all starts only after the first Promise.all is returned. I tried to do it using async/await but I noticed that although the result of second Promise.all is displayed after the first one, it is actually running IN PARALLEL (which is not what I want).

In the example,

...

ANSWER

Answered 2021-May-25 at 03:00

Your 2-second timeout starts executing the moment you create its promise (*). Promise.all doesn't "start" the promises, it merely ensures they are all resolved (or one of them failed) before it will resolve.

In order to make the sequence you desire, you have to create promise6 after values1 has been received.

Source https://stackoverflow.com/questions/67680937

QUESTION

Does Promise.allSettled preserve the original order in the response in all scenarios?

Asked 2021-Apr-26 at 21:52

When making multiple requests concurrently with Promise.allSettled, does the order of the array in the response correspond to the intitial array in the request? Does it maintain the same order regardless of the order in which they settle?

...

ANSWER

Answered 2021-Apr-26 at 21:52

Yes, it is guaranteed. The steps are described in the specification.

On each iteration over the passed iterable, it does

Set resolveElement.[[Index]] to index. Set rejectElement.[[Index]] to index.

where index is the current index in the iterable being iterated over, which then gets passed to the resolver or rejector algorithm. Both the resolver and the rejector does, at the end:

Set values[index] to obj.

where values is the array of resolve values that the whole Promise.allSettled will resolve with.

The nth item in the passed iterable/array will always correspond to the nth item in the resolved array.

Source https://stackoverflow.com/questions/67274188

QUESTION

when I learned about microtask and Promise , I came across a behavior I don't understand

Asked 2021-Mar-16 at 19:56

I didn't return something in then() callback, In my opinion the output should be 1 5 7 2 6 3 4,but the result is 1 2 5 3 6 7 4, who can tell me why

...

ANSWER

Answered 2021-Mar-16 at 19:56

Alright, this will be very verbose. Contrary to others, i'll claim, that the execution order for the console.log calls is completely deterministic here. This doesn't always have to be the case with async code, but when there isn't any "real" async code happening, it still often is.

Code numbered for clarity:

Source https://stackoverflow.com/questions/66660530

QUESTION

Make multi API requests simultaneously

Asked 2021-Mar-06 at 21:30

I have this code that returns the speed score of a website through google API. As sometimes the value is not correct, i read on a post, that is a good practice to make the request few times and then make the median of the score . How i can make multiple Api request simultaneously ?

I tried something like this

...

ANSWER

Answered 2021-Mar-06 at 21:24

Your issue here is that medianSpeed isn't returning a promise, so there's nothing to wait for.

If you did return Promise.allSettled... and then did a then block after calling the function: medianSpeed().then(values => {}) then you would get the values back.

I assume that the url variable is coming from somewhere else?

Source https://stackoverflow.com/questions/66510609

QUESTION

How exactly works this Promise.all() statement in my code?

Asked 2021-Jan-05 at 10:49

I am pretty new in JavaScript technoogies and RxJS and I have the following doubt about how exactly works this code. It is taken from a project on which I am working and it works fine but I need to understand how exactly Promise.all() works and how it is used in this code.

So basically I have this method used to save multiple files on Firebase Store:

...

ANSWER

Answered 2021-Jan-05 at 10:48

Promise.all

It will take an array of promises and execute them in parallel. It follows the mechanism of all or none

Promise.all([ ...]).then(console.log) will execute if all promises are fulfilled, otherwise it will execute catch Promise.all([ ...]).catch(console.log)

There is one more method Promise.allSettled This will consider a success even one of the promises is failed. return data contains all results with statues

Syntax:-

Source https://stackoverflow.com/questions/65577232

QUESTION

undefined is not a promise

Asked 2020-Dec-18 at 06:44

const promise1 = Promise.resolve(3);
const promise2 = 42;
const promise3 = new Promise((resolve, reject) => {
  setTimeout(resolve, 100, 'foo');
});

Promise.all([promise1, promise2, promise3]).then((values) => {
  console.log(values);
});
Promise(promise2).then((values) => {
  console.log(values);
});

...

ANSWER

Answered 2020-Dec-18 at 06:37

You need to use it like this:

Source https://stackoverflow.com/questions/65352672

QUESTION

AWS Lambda returns 502 when using Promise.all()

Asked 2020-Dec-05 at 10:23

Endpoint is returning 502 in every condition. I think my reponses are correctly structured but I still got 502 Bad Gateway error from my endpoint.

Responses was working when I was not dealing with Promise.all().

Timeout for this function is 30 seconds btw, but it doesn't take that long.

I have a handler like this:

...

ANSWER

Answered 2020-Dec-05 at 10:23

You should stick to using await or .then, instead of trying to use both.

Since your handler is already async you might as well use await.

I've modified your code below so that it no longer uses .then (not tested).

Source https://stackoverflow.com/questions/65155651

QUESTION

Does Promise.all() run in sequential or parallel in Angular?

Asked 2020-Sep-10 at 13:32

Does Promise.all() run in sequential or parallel in Angular?

For Example:

...

ANSWER

Answered 2020-Sep-10 at 13:32

Javascript is a single threaded application. However, asynchronous calls allow you to not be blocked by that call. This is particularly useful when making REST API calls. For example your promise1() can make a REST API call and before it waits for the results, another REST API call can be made from promise2(). This pseudo-parallelism is thus achieved by not waiting on API servers to do the tasks and fire multiple such calls to either same or different API endpoints in parallel. This allows your code to continue executing that parts that are not dependent on resolution of the promises.

So yes, promise1(), promise2() and promise3() can be said to be running in parallel in that respect. And there is a chance that promise2() gets resolved before promise1() and so on. The function Promise.all() waits for all the promises provided to it to fulfill or at least one of them to fail.

Learn more about Javascript event loops in this video by Jake Archibald.

Source https://stackoverflow.com/questions/63747246

QUESTION

How to chain promises together in JavaScript

Asked 2020-Sep-03 at 19:53

I'm trying to chain a sequence of Promises so that the second promise will start after the first one resolves and so on. I don't understand how I cannot get it to work correctly.

Here is my demo code:

...

ANSWER

Answered 2020-Sep-03 at 13:23

For the purposes of explaining why they all finish at the same time, we can ignore everything except the promise declarations:

Source https://stackoverflow.com/questions/63724036

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