foreach

问题 This question already has answers here : Using async/await with a forEach loop (18 answers) Closed 2 years ago . I'm a beginner in async await and promises. I read few articles and watch few tutorial videos but I am still not able to understand it completely. So I have a code that I'm working on right now }).then(function() { var responseArray = [] [url1,url2,url3,url4].forEach((url)=>{ makeRequest(url) }).then((response)=>{ responseArray.push(response) }) return responseArray }) So as

问题 As part of this question, it was pointed out repeatedly that I had an O(n^2) problem using code similar to this... public class Foo { public string IdentityValue {get;set;} public string Prop1 {get;set;} public string Prop2 {get;set;} } List<Foo> itemSet1 = GenerateLargeItemSet(); //makes a large list, > 5000 items for example List<Foo> itemSet2 = GenerateLargeItemSet(); foreach (var itemFromSet1 in itemSet1) { //does a corresponding item exist in itemSet2? var itemSet2Item = itemSet2

问题 I have a foreach loop that I would like to replace with a Linq query, but I've not been able to figure out how to write the query. Please see my example below and TIA. using System.Collections.Generic; using System.Linq; namespace ConsoleApplication { class ExampleProgram { static void Main( string[] args ) { Device device = new Device(); // The goal is to populate this list. var list1 = new List<IMemory>(); // I would like to replace this loop with a Linq query foreach( MemoryBank memoryBank

问题 I have a foreach loop that I would like to replace with a Linq query, but I've not been able to figure out how to write the query. Please see my example below and TIA. using System.Collections.Generic; using System.Linq; namespace ConsoleApplication { class ExampleProgram { static void Main( string[] args ) { Device device = new Device(); // The goal is to populate this list. var list1 = new List<IMemory>(); // I would like to replace this loop with a Linq query foreach( MemoryBank memoryBank

问题 I have a foreach loop that I would like to replace with a Linq query, but I've not been able to figure out how to write the query. Please see my example below and TIA. using System.Collections.Generic; using System.Linq; namespace ConsoleApplication { class ExampleProgram { static void Main( string[] args ) { Device device = new Device(); // The goal is to populate this list. var list1 = new List<IMemory>(); // I would like to replace this loop with a Linq query foreach( MemoryBank memoryBank

问题 I got access to an HPC cluster with a MPI partition. My problem is that -no matter what I try- my code (which works fine on my PC) doesn't run on the HPC cluster. The code looks like this: library(tm) library(qdap) library(snow) library(doSNOW) library(foreach) > cl<- makeCluster(30, type="MPI") > registerDoSNOW(cl) > np<-getDoParWorkers() > np > Base = "./Files1a/" > files = list.files(path=Base,pattern="\\.txt"); > > for(i in 1:length(files)){ ...some definitions and variable generation...

问题 Quick question, which I think has a very easy solution for someone who has anything above the most rudimentary knowledge of PHP/MySQL as I do. I have a list of cities in a variety of states stored in a database with city, state and some other variables. Right now they get pulled as a list sorted by city name: Anchorage, AK Baltimore, MD Chicago, IL etc etc. I want to be able to group by state first, then list all the cities that have that state value. So it'd look like: AK Anchorage Juneau CA

问题 Quick question, which I think has a very easy solution for someone who has anything above the most rudimentary knowledge of PHP/MySQL as I do. I have a list of cities in a variety of states stored in a database with city, state and some other variables. Right now they get pulled as a list sorted by city name: Anchorage, AK Baltimore, MD Chicago, IL etc etc. I want to be able to group by state first, then list all the cities that have that state value. So it'd look like: AK Anchorage Juneau CA

问题 Quick question, which I think has a very easy solution for someone who has anything above the most rudimentary knowledge of PHP/MySQL as I do. I have a list of cities in a variety of states stored in a database with city, state and some other variables. Right now they get pulled as a list sorted by city name: Anchorage, AK Baltimore, MD Chicago, IL etc etc. I want to be able to group by state first, then list all the cities that have that state value. So it'd look like: AK Anchorage Juneau CA

问题 As it currently stands, this question is not a good fit for our Q&A format. We expect answers to be supported by facts, references, or expertise, but this question will likely solicit debate, arguments, polling, or extended discussion. If you feel that this question can be improved and possibly reopened, visit the help center for guidance. Closed 7 years ago . I have the code below (which actually is much longer than you see!) foreach (SensorPair sensor in _sensorPairs) { sensorByte = (byte)