MAKE IT MODULAR (Exercise 6 of 13)

main_modular.js

var mod = require('./module1');
mod(process.argv[2], process.argv[3], function (err, listf) {
    if (err) {
        console.log('Error!')
    } else {
        for (var i = 0; i < listf.length; i++) {
            console.log(listf[i]);
        }
    }
});

module1.js

var fs = require('fs');
var ph= require('path');
module.exports = function (path, ext, callbk) {
var extn = "." + ext;
    fs.readdir(path, function (err, files) {
        if (err)
            return callbk(err);
        else {
            var listf = []; /
            for (var i = 0; i < files.length; i++) {
                if (ph.extname(files[i]) === extn) {
                    listf.push(files[i]);
                }
 }
            callbk(null, listf);
     }

    });
}