logo
down
shadow

Trying to define a promise.all


Trying to define a promise.all

By : user3100239
Date : January 12 2021, 01:40 AM
I wish did fix the issue. The issue with the code, as @Bergi said, was that the ".then" and ".catch" callbacks are called asynchronously and as a consequence of this, "fullArray" wasn't even filled when "resolve()" was called even when it was outside of the loop. To solve this, i simply added "resolve()" inside of the promise that finishes last, to do this, i simply added a "counter" binding that has the value of the length of the "promises" array, and is reduced by 1 every time ".then" was called on a promise and when this "counter" equals 0, it calls "resolve()".
But that only solves the problem of filling the "fullArray" with the promises, not the issue of those promises being ordered correctly by the order they were called, to solve this i simply enumerated them in the array with the "i" binding of the loop, the end result was this:
code :
function Promise_all(promises) {
  return new Promise((resolve, reject) => {
    if(promises.length == 0) resolve(promises);
    let fullArray = [],
        counter = promises.length;

    for(let i=0; i< promises.length ; i++){
         promises[i]
        .then(x => {
           fullArray[i] = x;
           counter--;
           if(counter == 0) resolve(fullArray)})
        .catch(reason => reject(new Error(reason)));
    }
  });
}


Share : facebook icon twitter icon
Define empty Bluebird promise like in Q

Define empty Bluebird promise like in Q


By : Narek Anatolyan
Date : March 29 2020, 07:55 AM
Hope this helps With Q I can define a new promise with:
code :
var resolver = Promise.defer();
setTimeout(function() {
    resolver.resolve(something); // Resolve the value
}, 5000);
return resolver.promise;
return new Promise(function(resolve, reject) {
    // Your code
});
var gitControl = Promise.promisifyAll(Main.gitControl);
var promises = [];
promises.push(gitControl.gitAddAsync(fileObj.filename, updateIndex));
return promises;
Define an empty Q.Promise<void>

Define an empty Q.Promise<void>


By : Airazel Perlas Capun
Date : March 29 2020, 07:55 AM
I hope this helps . I am new to Q and promises. I have a simple interface that I want to implement. To focus the question, I simplified the interface and its implemenration: , Importing Q worked:
code :
import * as Q from "q";
In TypeScript, what is the best way to define a function that can return either Promise<T> or Promise<T[]>?

In TypeScript, what is the best way to define a function that can return either Promise<T> or Promise<T[]>?


By : Aistis Matulis
Date : March 29 2020, 07:55 AM
Does that help I'm just starting with TypeScript and I ran across a situation in which the type definitions for a library I'm using is wrong. In my case, the library is Massive,js, and here are the type definitions. , You can define multiple types.
code :
interface Table<T> {
    // other functions omitted for simplicity
    save(data: object): Promise<T | T[]>;
    insert(data: object): Promise<T | T[]>;
    update(dataOrCriteria: object, changesMap?: object): Promise<T | T[]>;
  }
Define Promise As ES6 Class Method

Define Promise As ES6 Class Method


By : JustMeDaFaq
Date : March 29 2020, 07:55 AM
will help you Promises are just an object returned from a function — whether it be a method or not doesn't matter. Try this:
how axios promise define errors

how axios promise define errors


By : Hailu
Date : March 29 2020, 07:55 AM
it helps some times My understanding is that if any sort of networking issue occurs or if an error code is responded from the server then the promise is rejected.
An error code from the server is either a client error (4XX) or server error (5XX). Status code definitions.
Related Posts Related Posts :
  • redux how to use state
  • All data in the db is lost when closing a express based node js server
  • How to convert javascript code for Angular
  • XPath select on child nodes
  • Idle event on mouse move - how to stop script permanently on mouse move
  • Why do I get logic is not defined in this code
  • When I enter a number in the input, the first function starts
  • ES6 imports and node_modules hell
  • How to get css selector of clicked-on element?
  • How to auto input MySQL data (input column 1 data to auto input column 2 data with same column) in php?
  • Appending to Datalist Via Javascript
  • Customizing Material-UI Components with Styled-Components
  • Populate elements with class name using Javascript
  • How to execute promises in batches (first resolving 10, then next 10 and so on)
  • Maximo JS automation script: "importPackage" is not defined
  • How to surround selected text inside textarea with <em> on key combination CTRL+i?
  • Your configured registry does not support audit requests ~ On npm audit
  • What's the Angular equivalent of Vue <slot/>?
  • Iconify icon not updating when "data-icon" set with setAttribute()
  • Javascript newbie stuck with XMLHttpRequest return data
  • How to add obj to to state in my example Redux React
  • Loading "grunt-karma.js" tasks...ERROR >> SyntaxError: Unexpected identifier
  • Why do I get log is not defined
  • get the multiple index of the same string
  • How can I iterate over an Array object by using For IN or FOR OF
  • Launch local executable from web browser
  • How to prepare array of json objects to d3 hierarchical tree structure
  • VueJS - event emitted - show HTML before other calculations
  • Export SASS/SCSS variables to Javascript without exporting them to CSS
  • How to attach an event handler only once continuously
  • How to make button open a link in new tab in JavaScript?
  • Find range from the javascript object
  • How can I use my jQuery code as JavaScript?
  • How to show 5 images in a 2 row slider with bxslider
  • How to convert stream into variables in typescript
  • Three.js custom shader error on Chrome GL_INVALID_OPERATION: Active draw buffers with missing fragment shader outputs
  • My JavaScript doesn't work. How can I solve this problem?
  • Why is this async function is running synchronously?
  • Get updated variable from within react hook before return
  • I want to show all image preview but whenever I upload a new one the old one is gone
  • Would I be able to give access to specific electron APIs safely?
  • Why several clicks fire for each instance of a Class?
  • cant grab value from div using attr()
  • Instantiate subclass without constructing
  • Outputing a created object in javascript to a server side JSON file
  • Transition the numeric labels in a bar chart
  • createBottomTabNavigator: hide just one tab from the tabBar
  • iife vs simple statement behavior with document.title
  • showDialogPopup Refresh Page after Click
  • Child component does not set the initial value passed from the parent: ReactJS
  • Nodejs javascript added to button not responding
  • Python GEE to extract featurecollection timeseries from Landsat imageries
  • How to write negative binary number?
  • Unable to set property of individual object
  • Why Named Function Expression itself cannot assign Name to another Value?
  • How to reset scroll position on single page pagination
  • How to scroll to bottom of page, when a new message is sent - Socket.io
  • How to reconstruct audio blob from a base64 encoded String?
  • How to calculate numbers within an array of objects
  • Using JavaScript to change CSS properties of SVG circles for all circles that was not clicked
  • shadow
    Privacy Policy - Terms - Contact Us © festivalmusicasacra.org