promise

问题 When thrown from a promise every Error my custom error handler is getting does loose its type import { HttpErrorResponse } from "@angular/common/http"; import { ErrorHandler, Injectable, Injector, NgZone } from "@angular/core"; import { MatSnackBar } from "@angular/material"; @Injectable() export class GlobalErrorHandler implements ErrorHandler { constructor(private injector: Injector) { } handleError(error: any): void { if (error instanceof HttpErrorResponse) // this needs to be triggered

问题 When thrown from a promise every Error my custom error handler is getting does loose its type import { HttpErrorResponse } from "@angular/common/http"; import { ErrorHandler, Injectable, Injector, NgZone } from "@angular/core"; import { MatSnackBar } from "@angular/material"; @Injectable() export class GlobalErrorHandler implements ErrorHandler { constructor(private injector: Injector) { } handleError(error: any): void { if (error instanceof HttpErrorResponse) // this needs to be triggered

问题 Supose that I have the following for loop, which would obviously block the event loop for a while: function doStuff() { let max = 100_000_000_000_000n; for (let i = 1n; i <= max; i = i + 1n) { if (i === max) { // Do stuff, like return a value to a function. return 'Some value.'; } } } Can I wrap that operation (the for loop) inside a Promise, so it does not block the "main thread"? Something like that: function doStuff() { let max = 100_000_000_000_000n; return new Promise((resolve) => { for

问题 I want to launch two or more Future/Promises in parallel and fail even if one of the launched Future/Promise fails and dont want to wait for the rest to complete. What is the most idiomatic way to compose this pipeline in Scala. EDIT: more contextual information. I have to launch two external processes one writing to a fifo file and another reading from it. Say if the writer process fails; the reader thread might hang forever waiting for any input from the file. So I would want to launch both

问题 I have a problem with a promise using node.js. My code is below: var p1 = new Promise(function(resolve, reject) { // my function here }); p1.then(function(result){ // my result }); This code works but to get values from p1 I must use the .then method and my result values can be accessed just on p1.then . How do I access p1 values without .then ? Below are my expected results: var p1 = new Promise(function(resolve, reject) { // my function here }); var abc = NextFunction(p1); The p1 values

问题 If a promise is created this way: myPromise = new Promise(function(resolve, reject) {}); Can this promise be ever resolved by any way? Obviously, the executor is not resolving it in this case, so can the promise be ever resolved? I think if it is jQuery, it can be resolved by deferred.resolve() so that the related promise deferred.promise() is resolved. 回答1: No, the promise can only be resolved or rejected by the resolve and reject functions, respectively. If these functions aren't called nor

问题 If a promise is created this way: myPromise = new Promise(function(resolve, reject) {}); Can this promise be ever resolved by any way? Obviously, the executor is not resolving it in this case, so can the promise be ever resolved? I think if it is jQuery, it can be resolved by deferred.resolve() so that the related promise deferred.promise() is resolved. 回答1: No, the promise can only be resolved or rejected by the resolve and reject functions, respectively. If these functions aren't called nor

问题 I have a an API written in typescript and I try to run parallel queries for same document by using promise.allsettled however it performs worse and I guess they run sequentially. Is there a way to perform parallel queries on the same document in the same connection for mongoDB. here is the code: console.time("normal"); let normal = await ContentRepo.geBySkillIdWithSourceFiltered( [chosenSkillsArr[0].sid!], readContentIds, body.isVideoIncluded, true, true ); console.timeEnd("normal"); console

问题 I have a an API written in typescript and I try to run parallel queries for same document by using promise.allsettled however it performs worse and I guess they run sequentially. Is there a way to perform parallel queries on the same document in the same connection for mongoDB. here is the code: console.time("normal"); let normal = await ContentRepo.geBySkillIdWithSourceFiltered( [chosenSkillsArr[0].sid!], readContentIds, body.isVideoIncluded, true, true ); console.timeEnd("normal"); console

问题 I am a newbie to JS and I am trying to understand how Promise should work under the hood. Here is a custom implementation that looks reasonably good to me: class MyPromise { constructor(executor) { this._resolutionQueue = []; this._rejectionQueue = []; this._state = 'pending'; this._value; this._rejectionReason; try { executor(this._resolve.bind(this), this._reject.bind(this)); } catch (e) { this._reject(e); } } _runRejectionHandlers() { while(this._rejectionQueue.length > 0) { var rejection