Rename to sequence number

rename_sequence_number.js

var fs = require('fs');

fs.readdir('.', function(err, files) {
    if (err) throw err;

    var fileList = [];
    var index = 0;
    files.filter(function(file) {
        return fs.statSync(file).isFile() && /.*snapshot\.jpg$/.test(file);
    }).forEach(function(file) {
        var newfilename = 'image_' + ('000' + index).slice(-4) + ".jpg";
        fs.renameSync(file, newfilename);
        index++;
        // fileList.push(file);
        console.log(file, newfilename);
    })

});