does not return the function read file nodejs

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does not return the function read file nodejs

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#1 by (3 votes)

1

the read file function does not return anything, but if it shows by console

function leer(archivo){ 
    fs.readFile('./archivos/'+archivo, 'utf8',
        function(err, data) {

                return data;  
        }
    ); 
};

when I use it from another file

console.log(escritorLector.leer(files[a]));

shows nothing

However, by console it looks good (in the same file).

function leer(archivo){ 
    fs.readFile('./archivos/'+archivo, 'utf8',
        function(err, data) {
            console.log(data);
            return data;  
        }
    );
};

javascript nodejs

asked by hubman 07.10.2016 в 02:33

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1 answer

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score 3 · Accepted Answer

You will never get an answer because you are returning from the callback.

You have two options:

Pass a callback to leer .

Use fs#readFileSync .

Passing a callback

function leer(path, cb) {
  fs.readFile('/archivos/${archivo}', function(err, content) {
    if(err) { /* hacer algo */ }
    cb(content);
  });
}

And you would use it like this:

leer('archivo.dat', function(content) {
  console.log(content);
});

Use fs # readFileSync

function leer(path) {
  return fs.readFileSync('/archivos/${path}');
}

And this way if it works what you want:

console.log(leer('archivo.dat'));