Chancer

Simple collection of tools for generating random behaviour in Javascript. Uses a Mersenne Twister for more accurate random behaviour and repeatability.

Try out the test page in your browser.

Getting Started

You can use Chancer on the server side with Node.js and npm:

npm install chancer

you can then include Chancer in your script by using require:

var chancer = require('chancer');

On the client side, you can include Chancer in your page (found in build/chancer.js):

<script src="chancer.js"></script>

If you're including via a <script> tag, chancer is available as a global variable.

Seeding

You can specify a particular seed in order to get a repeatable random sequence:

chancer.seed( num )

Generates a seed that will always produce the same random sequence
num: (number) Integer to use as seed

chancer.seed(123);

Methods

chancer.random()

Generates a floating-point number between 0 and 1
return: (float) Returns the floating point number

chancer.random(); // 0.32831766246818006

chancer.float( min, max )

Generates a floating-point number between min (inclusive) and max (exclusive)
min: (number) Minimum inclusive number
max: (number) Maximum exclusive number
return: (float) Returns the floating point number

chancer.float(1, 10); // 2.794354454614222

chancer.int( min, max )

Generates an integer between min (inclusive) and max (inclusive)
min: (number) Minimum inclusive number
max: (number) Maximum inclusive number
return: (integer) Returns the integer number

chancer.int(1, 10); // 3

chancer.coinToss( heads, tails )

Generates a 0 or 1 to represent a coin toss
Optionally associate any other values for the coin sides (true/false, yes/no, heads/tails, etc)
heads: Value for the head
tails: Value for the tails
return: Returns the chosen value

chancer.coinToss(); // 1
chancer.coinToss(true, false); // true
chancer.coinToss('heads', 'tails'); // tails

chancer.fromArray( arr )

Generates a random item from an array
arr: (array) Array of items
return: (integer) Returns the randomly selected item

chancer.fromArray([ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]); // 6

chancer.shuffleArray( arr )

Generates an array shuffled into a random order
arr: (array) Array of items
return: (array) Returns the array shuffled into a random order

chancer.shuffleArray([ 1, 2, 3, 4, 5, 6, 7, 8, 9 ]); // [7, 3, 9, 4, 1, 6, 2, 5, 8]

chancer.fillArray( min, max, total )

Generates an array of integers between min (inclusive) and max (inclusive)
If no total specified return all possible values between min and max
min: (number) Minimum inclusive number
max: (number) Maximum inclusive number
total: (number) Total number of results | all
return: (array) Returns the chosen values

chancer.fillArray(1,10); // [3, 5, 4, 1, 6, 7, 8, 2, 10, 9]
chancer.fillArray(1,100,10); // [40, 66, 74, 39, 17, 99, 50, 70, 6, 15]

chancer.uuid()

Generates a random value as a universally unique identifier (UUID) version 4 (RFC4122)
return: (string) Returns string representation of a UUIDv4

chancer.uuid(); // 73f765b2-958a-45fb-be10-b9fcebdd6838

Browser Support

Tested in the following browsers

Chrome	Opera	Firefox	Safari	IE	iOS	Android	WindowsPhone
					3+	2.2+	8.1+

License

Chancer is licensed under the MIT license.
Copyright © 2015, Alex Kilgour