promise with loop and file read in nodejs

Question

I looked at lot of example but couldn\'t achieve it..so need help..

Problem..

1. the content from loop should be passed to execute one by one

Answer 1

The technique you're looking for is thenable chaining

var p= Q();
Object.keys(files).forEach(function(key){
  p = p.then(function(){ // chain the next one
    return Q.nfcall(fs.readFile, files[key].path, "binary", i). // readfile
      then(function (content) { // process content and save
        files.filename =  files[key].name;
        files.path = files[key].path;
        files.content_type = files[key].type;
        files.size = files[key].size;
        console.log(files.filename);
        files.content = binaryToBase64(content);
        return Q.npost(art.save, art); // wait for save, update as needed
    }));
  });
});

Basically, we tell each operation to happen after the previous one has finished by chaining them and returning which causes a wait on the asynchronous value.

As a byproduct you can later use

p.then(function(last){
    // all done, access last here
});

The handler will run when all the promises are done.