Aggregate results from multiple Promises in React Hook
I am trying to get a combined result from multiple promises inside a React hook.
But when I use the hook, the function getAll immediately returns empty, instead of returning all MyTypes.
es6-promise
How to show value from 2 promises in a single line?
I have a class with static methods returning promises. I am able to print in console the values returned by these promises in seperate lines. But I want to print in console in one line the weather and currency for a given city (say London).
The output should be like this:
how to cancel/abort ajax request in axios
I use axios for ajax requests and reactJS + flux for render UI. In my app there is third side timeline (reactJS component). Timeline can be managed by mouse’s scroll. App sends ajax request for the actual data after any scroll event. Problem that processing of request at server can be more slow than next scroll event. In this case app can have several (2-3 usually) requests that already is deprecated because user scrolls further. it is a problem because every time at receiving of new data timeline begins redraw. (Because it’s reactJS + flux) Because of this, the user sees the movement of the timeline back and forth several times. The easiest way to solve this problem, it just abort previous ajax request as in jQuery. For example:
What does jest.fn() do and how can I use it?
Can anyone explain how jest.fn() actually works, with a real world example, as I’m confused on how to use it and where it has to be used.
Can’t set state in react
So, I’m simply trying to set state in my react app. Simply get data from Axios, and then set state. But no matter what I do, the state will not set. I’ve tried putting it in a callback since it’s async and putting it my component did mount and component did update alas nothing. any pointers?
Jest/Enzyme | Test a function call in componentDidMount
What to do when you want to test that a function is been called, on componentDidMount() React lifecycle Method. Basically the component code looks like this: state = { randomStateToPopulate: [] }; // Test componentDidMount componentDidMount() { this.randomFunction(); } randomFunction= () => { listRandomData().then(({ data }) => { this.setState({ randomStateToPopulate: data }); }); }; So, … Read more
How do I parse one part of a nested query result? (Javascript and MySQL)
I am trying to get a nested structure from a MySQL query, and as a result of using JSON_OBJECT, one section of my return data is stringified. The data I am currently getting looks as follows:
How to handle the Promise rejects in the test cases in Jest?
I am working on a node JS project for which I am writing test cases.
Code –
Node.js Promise chain resolving too early
There’s something about chaining promises that I don’t understand. The Node.js snippet below produces the following output. Why is promise.allSettled called after the first sleep on line 18 and not after the 2nd one on line 21?
Why catch at the end of promise chain is not catching all the errors?
i have simple validation promises in my code which i execute like so