JavaScript Using promises with Node.js functions on example using promises with axios,using promises with react,using promises

I'm started learning JavaScript promises, but I can't understand how apply, for example, Q functions to Node.js callback functions.

In similar question is recommended to use Q.denodeify(), but it works well for fs.readFile() and don't works for fs.exists().

This is a simple functions that returns list of files and their sizes in directory:

function openDir(path, callback) {
    path = __dirname + path;
    fs.exists(path, function (exists) {
        if (exists) {
            fs.readdir(path, function (err, files) {
                if (err) {
                    throw err;
                }
                var filesCounter = 0,
                    filesTotal = files.length,
                    result = [];
                files.forEach(function (filename, index) {
                    fs.stat(path + filename, function (err, stats) {
                        if (err) {
                            throw err;
                        }
                        result[index] = {};
                        result[index].name = filename;
                        result[index].size = stats.size;
                        if (++filesCounter === filesTotal) {
                            callback(result);
                        }
                    });
                });
            });
        }
    });
}

http.createServer(function (req, res) {
    openDir('/', function (data) {
        res.writeHead(200, {
            'Content-Type': 'application/json; charset=utf-8'
        });
        res.end(JSON.stringify(data));
    });
}).listen(1337, '127.0.0.1');

How write this code using promises (with Q or other library)?

Answer:1

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