promise

问题 I am trying to zip a list of files before sending out through the http request. But I got stuck here. export default function zipTargetFiles(files) { if (files.length <= 1) { return files; } else { const zip = require('jszip')(); for (let i = 0; i < files.length; i++) { zip.file(files[i].name, files[i]); } return zip.generateAsync({type:"blob"}); } } Basically, the function takes in a list of files and tries to zip them into one single .zip file. But when i send it out as formed data, it gave

问题 I am trying to zip a list of files before sending out through the http request. But I got stuck here. export default function zipTargetFiles(files) { if (files.length <= 1) { return files; } else { const zip = require('jszip')(); for (let i = 0; i < files.length; i++) { zip.file(files[i].name, files[i]); } return zip.generateAsync({type:"blob"}); } } Basically, the function takes in a list of files and tries to zip them into one single .zip file. But when i send it out as formed data, it gave

问题 I have the following code. This code is supposed to receive an SQS message, read the body, then update a dynamo record with the information contained within that body. The update is not working which is one issue, but even stranger I'm not getting any output from the dynamodb update. The last line of output is the console.log which details the SQS message, then the function ends. How is this possible? Shouldn't dynamo return some kind of output? console.log('Loading function'); const util =

问题 A Promise constructor function can take a executor callback function and this question is about where does that callback function live in execution space when the executor callback function has asynchronous code. DETAILS : A Promise object represents a value that may not be available yet, but will be resolved at some point in the future. It allows you to write asynchronous code like making a call to a remote web service, you will create a Promise object which represents the data that will be

问题 A Promise constructor function can take a executor callback function and this question is about where does that callback function live in execution space when the executor callback function has asynchronous code. DETAILS : A Promise object represents a value that may not be available yet, but will be resolved at some point in the future. It allows you to write asynchronous code like making a call to a remote web service, you will create a Promise object which represents the data that will be

问题 A Promise constructor function can take a executor callback function and this question is about where does that callback function live in execution space when the executor callback function has asynchronous code. DETAILS : A Promise object represents a value that may not be available yet, but will be resolved at some point in the future. It allows you to write asynchronous code like making a call to a remote web service, you will create a Promise object which represents the data that will be

问题 I'm trying to implement Bullet train API in a React web app. According to their node client documentation, I have setup the following function: export const isFeatureEnabled = async (nameOfTheFeature) => { return new Promise((resolve) => { bulletTrain.init({ environmentID: BULLET_TRAIN_ENV_ID }); bulletTrain.hasFeature(nameOfTheFeature) .then((featureFlag) => { if (featureFlag[nameOfTheFeature].enabled) { resolve(true); } }) .catch(err => resolve(false)); }); } This is called in regular

问题 I have a promise function that receives a row from rows array to a remote server. const post = (row) => new Promise(resolve=> { //do post then, resolve(response.data); } So, I want to create a function that iterate through the array and execute post for each element in constant size batches. Before the execution of next batch, current batch should be resolved completely. How can I achieve this? 回答1: can use Promise.all for the batch and await for resolve: const post = (row) => new Promise

问题 I have written a function that is being called in a loop (map) and that function is using promises. Now, I want that function to run synchronously and exit before its next instance is called. function t1(){ let arr1 = [1,2,3,4,5]; return Promise.map(arr1, (val) =>{ const params = { "param1" : val1 }; return t2(params); }); } function t2(event){ return Promise.resolve() .then({ //do something //code doesn't reach here in sync manner. all five instance are invoked and then code reaches here for

问题 I have written a function that is being called in a loop (map) and that function is using promises. Now, I want that function to run synchronously and exit before its next instance is called. function t1(){ let arr1 = [1,2,3,4,5]; return Promise.map(arr1, (val) =>{ const params = { "param1" : val1 }; return t2(params); }); } function t2(event){ return Promise.resolve() .then({ //do something //code doesn't reach here in sync manner. all five instance are invoked and then code reaches here for