Miscellaneous Node utility functions

gistfile1.js

var fs = require('fs');

// Returns an Array of all directories in the current directory.
function getDirectories() {
  return fs.readdirSync('.').filter(function (file) {
    return fs.statSync(file).isDirectory();
  });
}

// Returns a copy of the given Array with all elements of the blacklist Array
// removed.
function removeBlacklisted(array, blacklist) {
  return array.filter(function (item) {
    return blacklist.indexOf(item) === -1;
  });
}

// Returns a flattened Array given an Array of Arrays.
function flatten(array) {
  return array.reduce(function (a, b) {
    return a.concat(b);
  }, []);
}