promisejs | Lightweight javascript implementation of promises | Reactive Programming library
kandi X-RAY | promisejs Summary
kandi X-RAY | promisejs Summary
Lightweight javascript implementation of promises.
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QUESTION
I am looking at https://www.promisejs.org/patterns/ and it mentions it can be used if you need a value in the form of a promise like:
...ANSWER
Answered 2021-Jan-14 at 01:58In your examples, yes, there's no point in calling Promise.resolve(value)
. The use case is when you do want to wrap your already existing value in a Promise, for example to maintain the same API from a function. Let's say I have a function that conditionally does something that would return a promise — the caller of that function shouldn't be the one figuring out what the function returned, the function itself should just make that uniform. For example:
QUESTION
I have a simple nodejs script to download youtube video and convert to mp3. I have some problems with promise pattern and need some help. Basically, there is only one resolve();
, but the script never reach that part. If I move resolve();
under console.log('Finished downloading! start to convert to mp3');
It starts to work, so the problem is something related to the resolve();
sitting side a callback function.
Full code: https://github.com/kenpeter/test_youtube_dl
Code snippet:
...ANSWER
Answered 2020-Apr-18 at 20:29This happens because .saveToFile
doesn't accept a callback.
Try running it like this:
QUESTION
I'm using a vis.js network that takes in some data and add's said data as nodes within the network.
The only issue is that after the network has been declared (using the nodes and edges specified, which may be a lot) it takes a while for the nodes in the network to render in.
Even when I declare the network like so:
...ANSWER
Answered 2017-Apr-03 at 12:02In the end I used the native loading bar to vis.js, using their example code here
It's a little faulty but it's all I needed.
QUESTION
I'm looking at the implementation of simple promise from https://www.promisejs.org/implementing/
I get most of the things here... but I'm not sure why this particular example needs to store handler as an array.
if we are pushing array only when the state is PENDING by the following code
...ANSWER
Answered 2019-May-03 at 04:28It's true that Promise chains do not add "additional handlers" to the head (first promise) of the chain.
In the case of a promise chain, each .then
or .catch
down the chain, returns a new Promise, therefore, you are correct that with Promise chains, you only need a single "handler"
However, any Promise can have more than one "listener" ... i.e. you can call its .then
method multiple times ... the promise returned by .then
is new, however, p
is still the same promise, so any .then
invoked on it is added as a handler
QUESTION
I started a simple Agent and I added a basic Intent named "myIntent" to it. I enabled fulfillment through the Firebase inline editor and, following the istructions I added a function named " myFunction" to the base one provided. This function contains a sample HTTPS GET request to https://reqres.in/api/users/2 .
My goal is to add a response to my intent based on the response provided by the GET call to the external API.
ANSWER
Answered 2018-Aug-03 at 16:13You are still immediately doing things with info
- now resolving the promise - instead of doing them from the asynchronous callback. Put the agent.add()
call or the resolve()
call in the end
handler so that it will happen only after the data is complete:
QUESTION
I'm currently making a Word Web Add-in using Visual Studio 2017 Community Edition (developing on Windows Server 2016 Standard - with RDP).
I need to add a dialog window to my application, because I need a little more screen estate for a part of my application.
So I'm showing a dialog as it's been explained over here: https://dev.office.com/docs/add-ins/develop/dialog-api-in-office-add-ins
...ANSWER
Answered 2017-Apr-01 at 13:08As I suspected, these are indeed 2 seperate issues.
It seems that it's impossible to sync to the document from within an add-in dialog. To fix this, I'm now passing the information back to the main user interface using this code:
QUESTION
I copied this code from an es6 generator functions tutorial into babel's online compiler in order to see what the generated code would look like
...ANSWER
Answered 2017-Apr-03 at 21:18This is a question about the use of the Babel.js online tool, rather than about generators or ES2016 more broadly.
The problem is that your code creates an infinite loop. It is possible to compile code that produces an infinite loop. Executing that code, however, will crash your browser. You have set the Babel website tool to evaluate the code.
If you untick the "evaluate" option or compile the code from the command line, Babel will cope with the transpilation just fine.
QUESTION
I have a simple for loop containing an async function, my problem is that the loop goes through all the values, then only executes the async function inside.
...ANSWER
Answered 2017-Mar-08 at 14:12You can use lodash.eachSeries but it is not best solution. If i were you i would try to move everything inside of for loop into a function so you will have all variables visible inside. More like this:
QUESTION
I have a nodejs server running and I installed the promise package which follows the promise api specs.
Since I succeeded in making denodeify(fn, length)
work, I am now in the process of chaining promises, but I am failing to grasp the main concepts.
By reading the documentation example on the specification page, I reached the following code:
...ANSWER
Answered 2017-Jan-17 at 15:21Nesting promises kind of defeats the purpose because it creates pyramid code (just like callbacks).
The main concept that may be escaping you is that you can return
inside a then
and the returned value (can be a promise or a value) can then be accessed in a chained then
:
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