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// PriorityQueue.js MIT License © 2014 James Abney http://github.com/jabney
(function(ex) {
'use strict';

// ---------------------------------------------------------------
// PriorityQueue Constructor
// A heap-based priority queue.
// ---------------------------------------------------------------
ex.PriorityQueue = function PriorityQueue(compare) {
  var compare = compare || function(a, b) { return a < b; },

jabney

// shuffle.js © 2014 James Abney http://github.com/jabney
(function(ex) {
'use strict';

// Export shuffle to 'random' namespace.
var random = ex.random || (ex.random = Object.create(null));

// Shuffle an array in place so that the positions of its values are random.
random.shuffle = function shuffle(a) {
  var i, r, tmp, len = a.length;

jabney

// setOps.js MIT License © 2014 James Abney http://github.com/jabney

// Set operations union, intersection, symmetric difference,
// relative complement, equals. Set operations are fast.
(function(so) {
'use strict';
  
  var uidList = [], uid;

  // Create and push the uid identity method.

jabney

// encode.js MIT License © 2014 James Abney http://github.com/jabney

// Encode built-in type as a numeric value.
//
// typeOf(null);      // => 'Null'
// typeOf(undefined); // => 'Undefined'
// typeOf([]);        // => 'Array'
//
// encodeType(null);      // => 1
// encodeType(undefined); // => 2

jabney

// declare.js MIT License © 2014 James Abney http://github.com/jabney

// An experiment with "forward type checking". Register types
// using 'declare' along with corresponding methods. The methods
// get called depending upon the type of the passed object. 
//
// // Create a new declare object.
// var logByType = fwdType.declare();
//
// // Register types and methods.

jabney

// entropy.js MIT License © 2014 James Abney http://github.com/jabney

/***************************************
 * ES2015
 ***************************************/

// Shannon entropy in bits per symbol.
function entropy(str) {
  const len = str.length