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function generator(pfunc){
    return function(){ // Generator object closure
        var i = 0; //state keeps track number of calls
        
        return {
            next: function(){ // iterator next() method
                var val = pfunc(i); //pfunc is the parameter function
                i++;
                return val;                
            }      

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function yfunc(prev, index, array, callback){
   	var newValue = callback(prev, index, array);
   	console.log(newValue);
	return function(){ 
		return yfunc(newValue, index++, array.push(newValue), callback)
	};
}

function yield(callback){
	return yfunc(null, 0, [], callback);

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<div id="disqus_thread"></div>
<script type="text/javascript">

    if(typeof DISQUS === "undefined"){
        var disqus_shortname = 'your_shortname'; // required: replace example with your forum shortname

        (function() {
            var dsq = document.createElement('script'); dsq.type = 'text/javascript'; dsq.async = true;
            dsq.src = '//' + disqus_shortname + '.disqus.com/embed.js';
            (document.getElementsByTagName('head')[0] || document.getElementsByTagName('body')[0]).appendChild(dsq);

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$(document).on("page:change", function() {
    $("#sheet_sort_order").change(function () {
        data = {
            "sort_order": this.value
        };
        $.get("/sheets", data, undefined, "script");
    });
});

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# FriendlyId Global Configuration
#
# Use this to set up shared configuration options for your entire application.
# Any of the configuration options shown here can also be applied to single
# models by passing arguments to the `friendly_id` class method or defining
# methods in your model.
#
# To learn more, check out the guide:
#
# http://norman.github.io/friendly_id/file.Guide.html

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module Paperclip
  # Handles generating preview images of Sheet PDFs
  class Preview < Processor

    def initialize(file, options = {}, attachment = nil)
      super
      @file = file
      @instance = options[:instance]
      @current_format   = File.extname(@file.path)
      @basename         = File.basename(@file.path, @current_format)

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class Sheet < ActiveRecord::Base
    bitmask :instruments, :as => [:guitar, :piano, :bass, :mandolin, :banjo, :ukulele, :violin, :flute, :harmonica, :trombone, :trumpet, :clarinet, :saxophone, :others], :null => false
    
    def self.instruments_to_bitmask(instruments)
        (instruments & Sheet.values_for_instruments).map { |r| 2**Sheet.values_for_instruments.index(r) }.inject(0, :+)
    end
end

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(**********************************)
(* Lab 2 : Higher-Order Functions *)
(**********************************)
(* We will discuss the initial part of this Lab as Tutorial
   for the Week of 8 Sept *)

(* This lab assignment must be submitted by 16Sept14 6pm *)

(*
  Q1: Last via List.fold_Left

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def max(*values)
 values.max
end

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require 'net/https'
require 'json'
uri = URI('https://api.clever.com/v1.1/districts/4fd43cc56d11340000000005/sections?limit=1000000000')

http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = true
http.verify_mode = OpenSSL::SSL::VERIFY_PEER

request = Net::HTTP::Get.new(uri.request_uri)
request.add_field 'Authorization', 'Bearer DEMO_TOKEN'