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{
"plugins": [ "plugins/markdown" ]
}

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lib-cov
*.seed
*.log
*.csv
*.dat
*.out
*.pid
*.gz
pids
logs
results
coverage
out
npm-debug.log
node_modules

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language: node_js
node_js:
- '0.10'
- '0.11'
branches:
only:
- /.*/
script:
- npm test
after_success: |
if [ "$TRAVIS_NODE_VERSION" = '0.10' ]; then
npm run codecov;
fi

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# Changelog
## 1.0.6: 2015-01-30
+ Regression tests using Mocha.
+ Travis CI support.
+ Codecov.io code coverage tracking support.
+ Add a proper CHANGELOG.md.
* Move shuffle.js to browser.js.
## 1.0.5: 2015-01-22
* Use `^` in `package.json` for support for old `npm`.
## 1.0.4: 2015-01-22
* Remove hard dependency on `node >= 0.10.0`.
## 1.0.3: 2015-01-22
* Move example.html to index.html for GitHub Pages.
* Check if seed is undefined or null rather than checking the number of
arguments.
## 1.0.2: 2015-01-19
* Fix order of operation.
* Support falsy `seed` values.
## 1.0.1: 2015-01-19
* Depend on `node >= 0.10.0`.
* Various fixes in `package.json`.
## 1.0.0: 2015-01-19
+ Proper README.
+ Example for using this module in the browser.
* Various fixes in `package.json`.
* Better error reporting on input not being an Array.
* JSDoc documentation.
## 0.0.0: 2015-01-19
+ Initial release.

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# knuth-shuffle-seeded
[![npm](https://img.shields.io/npm/v/knuth-shuffle-seeded.svg?style=flat)](https://www.npmjs.com/package/knuth-shuffle-seeded)
[![Build Status](https://img.shields.io/travis/TimothyGu/knuth-shuffle-seeded/gh-pages.svg?style=flat)](https://travis-ci.org/TimothyGu/knuth-shuffle-seeded)
[![Dependencies](https://img.shields.io/david/TimothyGu/knuth-shuffle-seeded.svg?style=flat)](https://david-dm.org/TimothyGu/knuth-shuffle-seeded#info=dependencies)
[![devDependencies](https://img.shields.io/david/dev/TimothyGu/knuth-shuffle-seeded.svg?style=flat)](https://david-dm.org/TimothyGu/knuth-shuffle-seeded#info=devDependencies)
[![Code Coverage](https://img.shields.io/codecov/c/github/TimothyGu/knuth-shuffle-seeded.svg?style=flat)](https://codecov.io/github/TimothyGu/knuth-shuffle-seeded?branch=gh-pages)
The Fisher-Yates (aka Knuth) shuffle for the browser and Node.js, with seeds
support using [seed-random](https://www.npmjs.com/package/seed-random).
This project is initially forked from
[coolaj86/knuth-shuffle](https://github.com/coolaj86/knuth-shuffle), but is
extended so that it is possible to specify a seed to use in the shuffling, to
ensure test reproducability.
Online demo: https://timothygu.github.io/knuth-shuffle-seeded/
## Getting Started
### Node.js
Installing:
```sh
npm install knuth-shuffle-seeded
```
### The Browser
Put browser.js into your directory for JavaScripts. Then take a look at
index.html.
You can also visit the page at
https://timothygu.github.io/knuth-shuffle-seeded/.
### API
```js
shuffle(inputArray[, seed])
```
See example.js for more examples.
## Why not contribute to the original repo?
I have considered that, but the introduction of an npm dependency makes it
necessary to use Browserify to generate a browser-compatible JavaScript file,
which is too far away from the simple approach of knuth-shuffle.
## Authors
- AJ O'Neal (@coolaj86) -- initial author
- Timothy Gu (@TimothyGu) -- seeding support
## License
Copyright 2013 AJ O'Neal
Copyright 2015 Tiancheng "Timothy" Gu
Licensed under the Apache License, Version 2.0 (the "License"); you may not
use this project except in compliance with the License. You may obtain a copy
of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.

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{
"name": "knuth-shuffle-seeded",
"version": "1.0.6",
"main": "browser.js",
"dependencies": {},
"devDependencies": {}
}

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!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.shuffle=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
"use strict";var randGen=require("seed-random");module.exports=function(r,n){var e,o,t,a;if(a=null==n?randGen():randGen(n),r.constructor!==Array)throw new Error("Input is not an array");for(e=r.length;0!==e;)t=Math.floor(a()*e--),o=r[e],r[e]=r[t],r[t]=o;return r};
},{"seed-random":2}],2:[function(require,module,exports){
(function (global){
"use strict";function ARC4(t){var o,n=t.length,r=this,a=0,i=r.i=r.j=0,e=r.S=[];for(n||(t=[n++]);width>a;)e[a]=a++;for(a=0;width>a;a++)e[a]=e[i=mask&i+t[a%n]+(o=e[a])],e[i]=o;(r.g=function(t){for(var o,n=0,a=r.i,i=r.j,e=r.S;t--;)o=e[a=mask&a+1],n=n*width+e[mask&(e[a]=e[i=mask&i+o])+(e[i]=o)];return r.i=a,r.j=i,n})(width)}function flatten(t,o){var n,r=[],a=(typeof t)[0];if(o&&"o"==a)for(n in t)try{r.push(flatten(t[n],o-1))}catch(i){}return r.length?r:"s"==a?t:t+"\x00"}function mixkey(t,o){for(var n,r=t+"",a=0;a<r.length;)o[mask&a]=mask&(n^=19*o[mask&a])+r.charCodeAt(a++);return tostring(o)}function autoseed(t){try{return GLOBAL.crypto.getRandomValues(t=new Uint8Array(width)),tostring(t)}catch(o){return[+new Date,GLOBAL,GLOBAL.navigator&&GLOBAL.navigator.plugins,GLOBAL.screen,tostring(pool)]}}function tostring(t){return String.fromCharCode.apply(0,t)}var width=256,chunks=6,digits=52,pool=[],GLOBAL="undefined"==typeof global?window:global,startdenom=Math.pow(width,chunks),significance=Math.pow(2,digits),overflow=2*significance,mask=width-1,oldRandom=Math.random;module.exports=function(t,o){if(o&&o.global===!0)return o.global=!1,Math.random=module.exports(t,o),o.global=!0,Math.random;var n=o&&o.entropy||!1,r=[],a=(mixkey(flatten(n?[t,tostring(pool)]:0 in arguments?t:autoseed(),3),r),new ARC4(r));return mixkey(tostring(a.S),pool),function(){for(var t=a.g(chunks),o=startdenom,n=0;significance>t;)t=(t+n)*width,o*=width,n=a.g(1);for(;t>=overflow;)t/=2,o/=2,n>>>=1;return(t+n)/o}},module.exports.resetGlobal=function(){Math.random=oldRandom},mixkey(Math.random(),pool);
}).call(this,typeof global !== "undefined" ? global : typeof self !== "undefined" ? self : typeof window !== "undefined" ? window : {})
},{}]},{},[1])(1)
});

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// This is a demo of using knuth-shuffle-seeded with Node.js.
'use strict'
var shuffle = require('./')
, assert = require('assert')
, a = [ 2, 11, 37, 42 ]
// shuffle() modifies the original array as well.
// Calling a.slice(0) creates a copy, which is then assigned to b
var copy = a.slice(0)
var b = shuffle(copy)
console.log(copy, b)
// Seed the following two functions the same way. The output should be the
// same.
var c = shuffle(a.slice(0), 2)
var d = shuffle(a.slice(0), 2)
console.log(c, d)
// The seed can be a string too:
var e = shuffle(a.slice(0), 'str')
var f = shuffle(a.slice(0), 'str')
console.log(e, f)
var g = shuffle(a.slice(0), '\ns\0t\rr\uD834')
console.log(g)
// It can even be an object or array, although it is not recommended to do so:
var h = shuffle(a.slice(0), { obj: true })
var i = shuffle(a.slice(0), new Date(0))
var j = shuffle(a.slice(0), a)
console.log(h, i, j)
// But it can't be undefined or null. If it is, then the "seed" is discarded
// and a random one will be used.

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="Fisher-Yates Shuffle Demo">
<meta name="author" content="Timothy Gu">
<title>Fisher-Yates Shuffle Demo</title>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/css/bootstrap.min.css" rel="stylesheet">
<style>
textarea.pre {
font-family: Menlo, Monaco, Consolas, "Courier New", monospace;
font-size: 1em;
}
</style>
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!--[if lt IE 9]>
<script src="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<article class="container">
<h1>
Fisher-Yates Shuffle Demo
</h1>
<p>
This is a demo of <strong><a href="https://github.com/TimothyGu/knuth-shuffle-seeded">knuth-shuffle-seeded</a></strong>. Enjoy!
</p>
<div class="col-sm-6">
<div class="form-group">
<label for="inputArray">Input</label>
<textarea class="form-control pre" id="inputArray" rows="8" placeholder="Enter JSON-formatted array"></textarea>
</div>
</div>
<div class="col-sm-6">
<div class="form-group">
<label for="seed">Seed</label>
<input type="text" class="form-control" id="seed" placeholder="Enter seed (optional)">
</div>
<div class="form-group">
<button type="submit" class="btn btn-default" onclick="shuffleInput('inputArray', 'out', 'seed')">
Submit
</button>
</div>
<pre id="out"></pre>
</div>
</article>
<footer class="container-fluid">
<p class="text-center small">
Made with ❤ by <a href="https://github.com/TimothyGu">@TimothyGu</a>. Copyright 2015. Apache License Version 2.0.
</p>
</footer>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.3/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.2/js/bootstrap.min.js"></script>
<script src="browser.js"></script>
<script>
function shuffleInput (inputId, outputId, seedId) {
var // Input array
arr = document.getElementById(inputId)
, // Output HTML element
out = document.getElementById(outputId)
, // User-specified seed
seed = document.getElementById(seedId).value
, // Output string
outStr
// Handle errors by catching it, print the message to the output HTML
// box, and throwing it again so that it's visible on the JS console.
function handleError(func) {
try {
func()
} catch (e) {
out.textContent = e.stack
throw e
}
}
// Parse input array.
handleError(function () {
arr = JSON.parse(arr.value)
})
// If the seed is empty, assume the user does not want to use a seed.
if (seed === '') seed = undefined
// If seed is a number assume the user wants to use a numerical seed.
else if (seed == String(+seed)) seed = +seed
handleError(function () {
// Shuffle the array with the seed, and stringifies it to outStr.
outStr = JSON.stringify(shuffle(arr, seed))
})
// Insert output string to the output HTML box.
out.textContent = outStr
}
</script>
</body>
</html>

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/*
* Copyright 2013 AJ O'Neal
* Copyright 2015 Tiancheng "Timothy" Gu
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict'
/**
* @file
*
* Implementation of the Fisher-Yates shuffle algorithm in JavaScript, with
* the possibility of using a seed to ensure reproducibility.
*
* @module knuth-shuffle-seeded
*/
var randGen = require('seed-random')
/**
* Shuffle an array using the Fisher-Yates shuffle algorithm, aka Knuth
* shuffle.
*
* Note that this function overwrites the initial array. As a result if you
* would like to keep the original array intact, you have to copy the initial
* array to a new array.
*
* Implementation derived from http://stackoverflow.com/questions/2450954/.
*
* @param {Array} array An array that is to be shuffled.
* @param [seed=Math.random()] Seed for the shuffling operation. If
* unspecified then a random value is used.
* @return {Array} The resulting array.
*/
module.exports = function shuffle(array, seed) {
var currentIndex
, temporaryValue
, randomIndex
, rand
if (seed == null) rand = randGen()
else rand = randGen(seed)
if (array.constructor !== Array) throw new Error('Input is not an array')
currentIndex = array.length
// While there remain elements to shuffle...
while (0 !== currentIndex) {
// Pick a remaining element...
randomIndex = Math.floor(rand() * (currentIndex --))
// And swap it with the current element.
temporaryValue = array[currentIndex]
array[currentIndex] = array[randomIndex]
array[randomIndex] = temporaryValue
}
return array
}

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{
"name": "knuth-shuffle-seeded",
"version": "1.0.6",
"description": "The Fisher-Yates (aka Knuth) shuffle for Node.js, with seeding support",
"main": "index.js",
"scripts": {
"test": "mocha",
"browserify": "browserify -s shuffle -g uglifyify -o browser.js index.js",
"prepublish": "npm run browserify",
"coverage": "istanbul cover node_modules/mocha/bin/_mocha",
"codecov": "npm run coverage && cat ./coverage/lcov.info | codecov"
},
"homepage": "https://github.com/TimothyGu/knuth-shuffle-seeded",
"repository": {
"type": "git",
"url": "git://github.com/TimothyGu/knuth-shuffle-seeded.git"
},
"keywords": [
"ronald",
"fisher",
"frank",
"yates",
"fisher-yates",
"donald",
"knuth",
"shuffle",
"random",
"randomize",
"unbiased",
"algorithm"
],
"author": "AJ O'Neal <coolaj86@gmail.com> (http://coolaj86.info/)",
"contributors": [
"Timothy Gu <timothygu99@gmail.com> (https://timothygu.github.io/)"
],
"license": "Apache-2.0",
"bugs": {
"url": "https://github.com/TimothyGu/knuth-shuffle-seeded/issues"
},
"dependencies": {
"seed-random": "~2.2.0"
},
"devDependencies": {
"browserify": "~8.1.1",
"codecov.io": "~0.0.8",
"istanbul": "~0.3.5",
"mocha": "~2.1.0",
"uglifyify": "~3.0.1"
}
}

119
node_modules/knuth-shuffle-seeded/test/test.js generated vendored Normal file
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// Licensed under the Apache License, version 2.0
'use strict'
var shuffle = require('..')
, assert = require('assert')
, test = [ 2, 11, 37, 42, 'adsf', 'blah', { heeeheee: true } ]
it('changes input array', function () {
var input = test.slice(0)
, a = shuffle(input)
assert.deepEqual(a, input)
})
describe('random shuffling', function () {
it('works', function () {
var a = shuffle(test.slice(0))
, b = shuffle(test.slice(0))
, c = shuffle(test.slice(0))
// Try three times.
// The possibility of this test being a false positive is:
//
// / 1 \ 3 -12
// |----| ≈ 7.81 × 10 ≈ 0.0000000078%
// \ 7! /
//
// That's good enough IMO.
try {
assert.notDeepEqual(test, a)
} catch (e) {
if (!(e instanceof AssertionError)) throw e
try {
assert.notDeepEqual(test, b)
} catch (e) {
if (!(e instanceof AssertionError)) throw e
assert.notDeepEqual(test, c)
}
}
})
})
describe('seeding with a number', function () {
var a, b
it('does not crash', function () {
a = shuffle(test.slice(0), 2)
b = shuffle(test.slice(0), 2)
})
it('output is the same for the same seed', function () {
assert.deepEqual(a, b)
assert.deepEqual(a, [ 'blah', { heeeheee: true }, 2, 'adsf', 11, 42, 37 ])
})
})
describe('seeding with a object', function () {
var obj1 = { blah: 'ad', bla: 4 }
, obj2 = new Date()
, a
, b
it('does not crash', function () {
a = shuffle(test.slice(0), obj1)
b = shuffle(test.slice(0), obj2)
})
})
describe('seeding with a string', function () {
var str = 'Lorem ipsum'
, a
, b
it('does not crash', function () {
a = shuffle(test.slice(0), str)
b = shuffle(test.slice(0), str)
})
it('output is the same for the same seed', function () {
assert.deepEqual(a, b)
assert.deepEqual(a, [ { heeeheee: true }, 2, 'blah', 11, 'adsf', 42, 37 ])
})
})
describe('errors', function () {
it('on String input', function () {
assert.throws(function () {
shuffle('adf')
})
})
it('on Boolean input', function () {
assert.throws(function () {
shuffle(true)
})
})
it('on Object input', function () {
assert.throws(function () {
shuffle({ a: true })
})
})
it('on Number input', function () {
assert.throws(function () {
shuffle(40)
})
})
it('on null input', function () {
assert.throws(function () {
shuffle(null)
})
})
it('on undefined input', function () {
assert.throws(function () {
shuffle(undefined)
})
})
it('not on empty array', function () {
var a = shuffle([])
assert.deepEqual(a, [])
})
})