Directory filtering to omit dotfiles

buildAppsObject.filter.js

// Using Array#filter to create array without any dotfiles
var fs          = require('fs');
var handlebars  = require('handlebars');

module.exports = function(){


    var appsArray   = fs.readdirSync('apps').filter(function(dir) {
        // return true if `dir` does not start with a `.`
        // to avoid dotfiles causing ENOTDIR (not a directory) errors
        return !dir.match(/^\.[\w -]/);
    });
    var apps        = {};


    for( var i = 0; i < appsArray.length; i++ ){
        var appName     = appsArray[i];
        var app         = {};

        app.name            = appName;
        app.path            = 'apps/' + app.name;
        app.componentsPath  = app.path + "/components"
        app.main            = app.path + '/app.js';
        app.config          = findConfig( app.path );
        app.filesToWatch    = [
            app.path + '/**/*.js',
            app.path + '/**/*.hbs',
            // exclude templates.js from triggering a rebuild
            // b/c this file is created on build
            '!' + app.path + '/main/templates.js',
            '!' + app.path + '/components/**/templates.js',
            '!' + app.path + '/components/components.js'
        ];

        // Get all components in current app folder
        var componentsArr       = fs.readdirSync( app.componentsPath );
        var compoentsJSIndex    = componentsArr.indexOf( "components.js" );

        // make sure we are not including the components.js file in out list
        if( compoentsJSIndex != -1 ){
            componentsArr.splice( compoentsJSIndex , 1 );
        }



        app.components = [];
        for( var j = 0; j < componentsArr.length; j++ ){

            var component       = {};
            component.name      = componentsArr[j];
            component.path      = "apps/" + app.name + "/components/" + component.name;
            component.config    = findConfig( component.path );


            app.components.push( component );

        }

        var source = "module.exports = { \n" +
             "{{#each components}} \n" +
             "     '{{name}}': { \n" +
             "        app : require('./{{name}}/main'), \n" +
             "        config : { \n" +
             "            present : false, \n" +
             "            options : {} \n" +
             "        } \n" +
             "    }, \n" +
             "{{/each}} \n" +
        "}";

        var template            = handlebars.compile(source);
        app.componentsString    = template(app);

        apps[ app.name ] = app;
    }

    return apps;
};

function findConfig ( configFolderPath ){
    var confiFolder     = fs.readdirSync( configFolderPath );
    var indexOfConfig   = confiFolder.indexOf("config.json");
    var config          = { hasConfig : false , path : null };

    if( indexOfConfig != -1 ){
        config.hasConfig    = true;
        config.path         = "./" + configFolderPath + "/config.json";
    }

    return config;
}

buildAppsObject.if.js

// Using a simple if statement
var fs          = require('fs');
var handlebars  = require('handlebars');

module.exports = function(){


    var appsArray   = fs.readdirSync('apps');
    var apps        = {};


    for( var i = 0; i < appsArray.length; i++ ){
        var appName     = appsArray[i];
        
        // continue if current iteration is not a dotfile
        if (!appName.match(/^\.[\w -]/)) {
          var app         = {};
  
          app.name            = appName;
          app.path            = 'apps/' + app.name;
          app.componentsPath  = app.path + "/components"
          app.main            = app.path + '/app.js';
          app.config          = findConfig( app.path );
          app.filesToWatch    = [
              app.path + '/**/*.js',
              app.path + '/**/*.hbs',
              // exclude templates.js from triggering a rebuild
              // b/c this file is created on build
              '!' + app.path + '/main/templates.js',
              '!' + app.path + '/components/**/templates.js',
              '!' + app.path + '/components/components.js'
          ];
  
          // Get all components in current app folder
          var componentsArr       = fs.readdirSync( app.componentsPath );
          var compoentsJSIndex    = componentsArr.indexOf( "components.js" );
  
          // make sure we are not including the components.js file in out list
          if( compoentsJSIndex != -1 ){
              componentsArr.splice( compoentsJSIndex , 1 );
          }
  
  
  
          app.components = [];
          for( var j = 0; j < componentsArr.length; j++ ){
  
              var component       = {};
              component.name      = componentsArr[j];
              component.path      = "apps/" + app.name + "/components/" + component.name;
              component.config    = findConfig( component.path );
  
  
              app.components.push( component );
  
          }
  
          var source = "module.exports = { \n" +
               "{{#each components}} \n" +
               "     '{{name}}': { \n" +
               "        app : require('./{{name}}/main'), \n" +
               "        config : { \n" +
               "            present : false, \n" +
               "            options : {} \n" +
               "        } \n" +
               "    }, \n" +
               "{{/each}} \n" +
          "}";
  
          var template            = handlebars.compile(source);
          app.componentsString    = template(app);
  
          apps[ app.name ] = app;
      }
    }

    return apps;
};

function findConfig ( configFolderPath ){
    var confiFolder     = fs.readdirSync( configFolderPath );
    var indexOfConfig   = confiFolder.indexOf("config.json");
    var config          = { hasConfig : false , path : null };

    if( indexOfConfig != -1 ){
        config.hasConfig    = true;
        config.path         = "./" + configFolderPath + "/config.json";
    }

    return config;
}

Does one run faster than the other?

At first performance seemed marginal with the if statement slightly quicker, but after adding 16 items to the apps directory (12 dotfiles, which is truly an "edge case" that will probably never happen and 4 actual directories with apps in them) it appears the filter may actually be slightly faster under load somehow.

Test case 16 items, 12 being dotfiles and 4 directories with code inside
Each variation run 8 times

Filter

• Average: 4.76s
• Total time: 38.07s
• Quickest time: 4.29s
• Slowest time: 7.16s

If

• Average: 5.01s
• Total time: 40.09
• Quickest time: 4.28s
• Slowest time: 7.49s

The dotfiles take longer to filter through (5 regex steps vs 3) so I figured I'd add a ton of them to see if I could really stress it out without adding a ton of code that may take a variable amount of time to install.