clamstew

var cls = [];
Array.prototype.slice.call( document.querySelectorAll('*'), 0 ).forEach( function ( el ) {
	cls = cls.concat( Array.prototype.slice.call( el.classList, 0 ) );
} );
cls = cls.reduce( function ( p, c ) {
	if ( p.indexOf( c ) < 0 ) p.push( c );
	return p;
}, [] );
console.log( cls );

clamstew

/*!
 * Grunt
 * $ npm install grunt-contrib-uglify grunt-autoprefixer grunt-contrib-cssmin grunt-contrib-imagemin grunt-contrib-sass grunt-contrib-watch grunt-contrib-concat grunt-contrib-clean grunt-contrib-jshint grunt-notify --save-dev
 */

module.exports = function(grunt) {

  grunt.initConfig({

    // Sass

clamstew

    def initialize (args={:event_time, :deadline, :event_name, :event_location, :minimum_attendees, :maximum_attendees, :creator_name, :phone, :email, :invitees})
      @required = args.fetch(:event_time, :deadline, :minimum_attendees) # .fetch will throw an error if key doesn't exist in Hash
      @optional = args[:creator, :event_name, :event_location, :attendees, :maximum_attendees] # simple access returns nil if key isn't set--no exception raised
    end