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Write the sum of the values in to another file using Nodejs asynchronously


Write the sum of the values in to another file using Nodejs asynchronously

By : user2173498
Date : October 20 2020, 08:10 PM
fixed the issue. Will look into that further I have a file readData.txt has the values "10,20,30,40,50,........"like this I have the numbers. , You can use the callback parameter of fs.readFile:
code :
fs.readFile('/etc/passwd', (err, data) => {
  if (err) throw err;
  console.log(data);
});
const data = new Uint8Array(Buffer.from('Hello Node.js'));
fs.writeFile('message.txt', data, (err) => {
  if (err) throw err;
  console.log('The file has been saved!');
});
fs.readFileSync('<directory>');


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nodejs express read file and return response asynchronously

nodejs express read file and return response asynchronously


By : Jasmeet Narula
Date : March 29 2020, 07:55 AM
may help you . I want to do something like this
code :
fs.readFile("data/wx.hourly.txt", "utf8", function(err, data){
    if(err) throw err;

    var resultArray = //do operation on data that generates say resultArray;

    res.send(resultArray);
});
Write to a log file asynchronously from asp.net task

Write to a log file asynchronously from asp.net task


By : Simon Lidster
Date : March 29 2020, 07:55 AM
I hope this helps you . I think that the issue you have is due to the fact multiple threads are accessing the file at the same time.
A better approach would be to make sure only one thread access the file at a time. You could use a lock (see this SO) or append the messages to be written to a concurrentQueue of string, then process that queue on another thread.
code :
private _Logger as new Logger
Private Sub joblog_append(Message As String)
 _Logger.Log(Message)
End Sub
'Missing: Idisposable, Fileaccess.Shared, 
'TODO: remove debugger.break
Public class Logger
Public Property Messages As new ConcurrentQueue(Of string)
private _WorkerTask as Task 

private event WorkerTaskCompleted
private _Stream as FileStream
private _Writer as StreamWriter

Public sub New()
    _Stream = io.file.OpenWrite("Mylog.txt")
    _Writer = New StreamWriter(_Stream)
End sub


Public sub Log(Message as string)
    Messages.Enqueue(Message)
    if _WorkerTask Is Nothing
        _WorkerTask = New Task(sub()
                                   While Messages.Any
                                       Dim CurrentMessage as string = ""
                                       if Messages.TryDequeue(CurrentMessage)
                                           _Writer.WriteLine(CurrentMessage)

                                           else
                                           debugger.Break
                                       End If
                               End While
                                     _Writer.Flush
                                      _Stream.Flush
                                   RaiseEvent WorkerTaskCompleted
                               End Sub)
        _WorkerTask.Start
    End If

    End sub
    Private Sub Logger_WorkerTaskCompleted() Handles Me.WorkerTaskCompleted
    _WorkerTask = Nothing
    End Sub
    End Class
NodeJS - How to read multiple files asynchronously and write read contents to one file

NodeJS - How to read multiple files asynchronously and write read contents to one file


By : Jason Grob
Date : March 29 2020, 07:55 AM
it helps some times User Promises by one of the following method
Create promises, each one is resolved when file is read Use bluebird to create Promise-like methods for fs Use fs-promise module
code :
if (filesRead === numberOfFilesToRead){
    //write things
}
Nodejs: How to do String.replace with file content asynchronously?

Nodejs: How to do String.replace with file content asynchronously?


By : J.Gatz
Date : March 29 2020, 07:55 AM
I wish this help you I'd recommend not attempting to do this in a single function. Break down what you need to do, especially as async is involved.
code :
const fs = require('fs');

// find a list of unique file references
function findFiles (data) {
  const files = {};
  const regex = /{{(.*?)}}/g;
  while ((match = regex.exec(data)) != null) {
    files[match[1]] = true;
  }
  return Object.keys(files);
}

function replaceFile (data, filePath) {
  return new Promise((resolve, reject) => {
    fs.readFile(`./include${filePath}`, function (err, fileData) {
      if (err) {
        console.log(err);
        return resolve(data);
      }
      // we can replace multiple file references without reading
      // the file multiple times.
      const regex = new RegExp('{{' + filePath + '}}', 'g');
      return resolve(data.replace(regex, fileData));
    });
  });
}

// use of reduce to allow us to chain the promises so we modify
// data one file at a time and don't rely on it bing a reference
// which we're modifying.
function replaceFiles (data, filePaths) {
  return filePaths.reduce(
    (promise, filePath) => {
      return promise.then((newData) => {
        return replaceFile(newData, filePath);
      });
    },
    Promise.resolve(data)
  );
}

const data = 'hello {{/file.txt}} {{/file2.txt}} {{/file.txt}} world';

const filePaths = findFiles(data);
console.log({ filePaths });

replaceFiles(data, filePaths)
.then(data => console.log({ data }));
Write asynchronously to file in perl

Write asynchronously to file in perl


By : GautamVedala
Date : March 29 2020, 07:55 AM
wish help you to fix your issue Basically I would like to: ,
Asynchronously write this array data
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