fs-stat give value out - Node.js

Question

my problem is that I want to have the processing time outside the fs-stat-function. How do I achieve this? With async that does not work, or how would you do that?

var time;
time = fs.stat(path, function(err, stats){  
  timestamp = stats.mtimeMs;
  console.log(timestamp); // 65463453
  return timestamp;
});

How can I get the result from the "function(err,stats)" of "fs-stat" in the variable "time"?

where do you want to use this value? Best way to use this you can create a promise then call from any function. — Sayed Tauseef Haider Naqvi, Feb 14 '19 at 10:18
@SayedTauseefHaiderNaqvi I want to use this value in the function that is outside around and how can I make a promise out of that? — gegner1111, Feb 14 '19 at 10:21
remove your comment from answers and update in your question so that other people will also understand the question — Sayed Tauseef Haider Naqvi, Feb 14 '19 at 10:35
See https://stackoverflow.com/questions/14220321/how-do-i-return-the-response-from-an-asynchronous-call — vsemozhebuty, Feb 14 '19 at 13:35

Sayed Tauseef Haider Naqvi · Accepted Answer · 2019-02-14T10:44:22.620

1

You can write code like this and call getTime function with promise and you will get the value.

var fs = require('fs');
function getTime(path) {
    return new Promise(function (resolve, reject) {
        fs.stat(path, function (err, stats) {
            if (err) {
                return reject(err)
            }
            return resolve(stats.mtimeMs);
        });
    })
}

call function like this

getTime('./').then(function (timestamp) {
    console.log(timestamp)
})

edited Feb 14 '19 at 10:44

answered Feb 14 '19 at 10:31

Sayed Tauseef Haider Naqvi

478
1
8
16

i tested it, but this code doesnt work =( when i give it out comes "undifined" – gegner1111 Feb 14 '19 at 10:36
@gegner1111 fixed – Sayed Tauseef Haider Naqvi Feb 14 '19 at 10:44
@SayedTauseefHaiderNaqvi next problem ... with the way you showed me, the time is only accessible within the "then" block. Is there a way to use the time outside this block? – gegner1111 Feb 14 '19 at 10:55
@gegner1111 Can you please share your code where you want to use this value so that I can better understand your uses. – Sayed Tauseef Haider Naqvi Feb 14 '19 at 12:07
@SayedTauseefHaiderNaqvi i have fixed it. Thx anyway! – gegner1111 Feb 14 '19 at 12:20

score 0 · Answer 2 · answered Feb 14 '19 at 10:27

@SayedTauseefHaiderNaqvi

This is the complete code:

function getTime(path) {

   var fs = require('fs');
   var time;
   time = fs.stat(path, function(err, stats){  
     timestamp = stats.mtimeMs;
     console.log(timestamp); //65463453
     return timestamp;
   });
   console.log(time); //undefined
   return time;
 }

fs-stat give value out - Node.js

2 Answers2