promises | Promises/A+ library for PHP with synchronous support | Reactive Programming library
kandi X-RAY | promises Summary
kandi X-RAY | promises Summary
Promises/A+ implementation that handles promise chaining and resolution iteratively, allowing for "infinite" promise chaining while keeping the stack size constant. Read this blog post for a general introduction to promises.
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Top functions reviewed by kandi - BETA
- Adds pending .
- Call a handler .
- Require a set of promises .
- Return the promise .
- Get all of the promises .
- Wait for the promise if it is pending .
- Return a promise for the given value .
- Handles success .
- Convenience method for resolving all of the iterable .
- Handles a failure .
promises Key Features
promises Examples and Code Snippets
bcrypt.hash(myPlaintextPassword, saltRounds).then(function(hash) {
// Store hash in your password DB.
});
// Load hash from your password DB.
bcrypt.compare(myPlaintextPassword, hash).then(function(result) {
// result == true
});
bcrypt.com
function resolve() {
if ( !( --count ) ) {
defer.resolveWith( elements, [ elements ] );
}
}
Community Discussions
Trending Discussions on promises
QUESTION
I am setting up a Storybook with RemixJS. I got the following error when trying to import a component
...ANSWER
Answered 2022-Mar-11 at 12:09Depending on the webpack version you are using to build your Storybook you need to add fs
, stream
and other Node core module used by Remix packages.
As a rule of thumb you can use the list from Webpack documentation on resolve.fallback
here.
If you are using Stroybook with Webpack 4 the config should look like :
QUESTION
I'm trying to cover some logic with unit tests and have a problem with Task.ContinueWith
method. The problem is that I have an important logic in the ContinueWith
task. The ContinueWith
task will be executed after the specified task, but there is no guarantee it will be executed immediately. So as a result, my test sometimes fails and sometimes succeeds.
There is my code:
The method:
...ANSWER
Answered 2022-Jan-10 at 11:58You don't need to create another ContinueWith task, you just need to wait for the previously created task.
QUESTION
I'm having trouble understanding how/why parentheses work where they otherwise should not work®.
...ANSWER
Answered 2022-Jan-09 at 16:14Note: When referring to documentation and source code, I provide links to an unofficial GitHub mirror of R's official Subversion repository. The links are bound to commit 97b6424 in the GitHub repo, which maps to revision 81461
in the Subversion repo (the latest at the time of this edit).
substitute
is a "special" whose arguments are not evaluated (doc).
QUESTION
After my machine updated automatically, NPM is not working any more
...ANSWER
Answered 2021-Nov-19 at 13:51Upgrade your node version, you're using the newest npm version, and it doesn't support old versions of node
Since you're on ubuntu i recommend you to use nvm
sudo apt-get install nvm
QUESTION
I can't understand why my ExpressJs app is crashing sending res.status(401)
inside a middleware.
Let's say my start.js has:
app.use(middlewares.timestampValidator());
and the middleware is declared as follow:
...ANSWER
Answered 2021-Dec-30 at 16:37I got the same thing in my nodejs application. My middleware was crashing in the application, and after some time of the crash, the unhandlesPromiseRejectionException was raised. The middleware is not async, but this crash is stopping the execution of the code (if try catch is not used to handle it), thereby terminating the entire process and then after a while the exception is raised.
If you notice the time of error receiving on the client, you could see that you get the error on the client sooner and the PromiseException gets raised later. I would ask you to check, if the error you get on the client, is that a timeout error, or the error code that you have thrown
I think Express just raises unhandled exception in middlewares as unhandledPromiseRejection By default as it is a break in its api hittin process which is asynchronous by default. EVen though your middleware is synchronous, but it is placed in an asynchronous process of an API route, and if anything crashes in it which is not handled, it will raise an UnhandledPromiseRejectionException as it is a crash in an asynchronous process.
Try to think of it as this : -
QUESTION
In my program source code I have the following function (Promise concurrency limitation function, similar to pLimit):
...ANSWER
Answered 2021-Nov-26 at 13:37You have await
inside async function. This works roughly as follows:
- Execute code line by line until
await
keyword - Pause execution of this code block
- Once awaited value resolved continue until next
await
keyword
In your case, it iterates 20 times, then pauses everything once you hit a limit. Then, once at least one promise inside ret
resolved it proceeds.
Next thing that is happening is that once any of the promises resolved, removes itself from array. But since almost everything happens instantaneously, you see that it - resolves all 20 promises, fills with another 20. If you make your iteratorFn
slower with random delays, you'll see, that pool is constantly filling up to 20 and then almost immediately replaces freed space in pool with new promise, while there is at least some elements left.
Let's replace your iteratorFn
with this and call it:
QUESTION
I'm wondering if there is a way in the Prisma Client to batch delete database records by id.
Something like this doesn't seem to exist:
...ANSWER
Answered 2021-Nov-30 at 22:24Did you try using the in
operator?
QUESTION
There are types with self flattening nature that is called Idempotence:
https://en.wikipedia.org/wiki/Idempotence
Idempotence is the property of certain operations in mathematics and computer science whereby they can be applied multiple times without changing the result beyond the initial application.
In JavaScript/TypeScript, we have Object/Number object for instance of idempotence.
A real world use-case is to write your own Promises with proper type in TypeScript. You can never have Promise>
only ever Promise
since promises auto-flatten. The same can happen with monads, for example.
ANSWER
Answered 2021-Nov-05 at 23:29You could write an idempotent wrapper around some inner type:
QUESTION
New to MongoDB, very new to Atlas. I'm trying to set up a trigger such that it reads all the data from a collection named Config
. This is my attempt:
ANSWER
Answered 2021-Oct-14 at 18:04The connection has to be a connection to the primary replica set and the user log in credentials are of a admin level user (needs to have a permission of cluster admin)
QUESTION
ANSWER
Answered 2021-Sep-27 at 06:40The "render" function of React is a synchronous, pure function. It can't wait for values to be rendered. This is what lifecycle methods and state are for.
Use useState
hook to hold the students
array in state, and an useEffect
hook with empty dependency array to make the call to getStudents
and await for the Promise to resolve and enqueue a state update and trigger a rerender.
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