Can Multiple fs.write to append to the same file guarantee the order of execution?

Question

Assume we have such a program:

// imagine the string1 to string1000 are very long strings, which will take a while to be written to file system
var arr = [\"         


        

Answer 1

You can synchronize the access to the file using the read/write locking for node, please see the following example an you could read the documentation

var ReadWriteLock = require('rwlock');

var lock = new ReadWriteLock();

lock.writeLock(function (release) {
  fs.appendFile(fileName, addToFile, function(err, data) {
    if(err) 
      console.log("write error"); //logging error message
    else    
      console.log("write ok");

    release(); // unlock
   });    
});