Chance - Your All-Purpose JavaScript Data Generator
Chance - Your All-Purpose JavaScript Data Generator
Written by Ian Elliot   
Wednesday, 24 July 2013

So you need to test your program, but where do you get some test data from? Chance is a small JavaScript library that will generate random data of various types - like telephone numbers - for you. 

The temptation is to headline this piece with "Chance would be a fine thing", but it would really have to be "Chance is a fine thing" to avoid misleading the reader. Chance is a relatively new library of JavaScript functions which generate test data. 

 

chancebanner

 

For example if you need a random zip code you simply use:

chance.zip()

and you get a random number with the characteristics of a zip code. The same for

chance.phone()

but notice that these aren't necessarily "real" in the sense that the zip code or the phone number might not actually exist, they simply fit the pattern for the type of data so that you can feed them to a function that is supposed to work with them. 

To use it all you have to do is include the library, about 5Kbytes minified and zipped, and start using it. It creates a global chance object but you can also create additional chance objects and initialize the seed for the random number generator so to produce a repeatable pseudo-random sequence.  It works in the browser or with Node.js. 

As well as generating text and formatted data types, it also has some random generators for primitive types - Boolean, character, integer and so on and, yes there is a dice! 

Although the library is quite young, it has a good collection of advanced generators. For example, it will generate random sentences, paragraphs, names, domains, email addresses, postal addresses, time stamps, credit card numbers and, my own favorite, don't ask why, random GUIDs.  For a full list of generators, see the Chance website.

The library is available under an Open Source MIT licence and there is lots of scope for adding additional generators. Given that each generator is small and fairly standalone it would make a good starting point for anyone wanting to get involved in a first open source project. 

 

chanceicon

Banner


The Weekly Top 10: Ruby and Rails
28/07/2016

The I Programmer team tries to cover as many as possible of the languages you might be interested in, but now and then it's good to have outside help. This round up of posts from around the web is foc [ ... ]



Mayhem Wins DARPA Cyber Grand Challenge
09/08/2016

Mayhem, a fully autonomous system for finding and fixing computer security vulnerabilities, emerged as the winner of the first all-machine hacking tournament held last week at the DEF CON hacker  [ ... ]


More News

 

 

 

 

Last Updated ( Wednesday, 24 July 2013 )
 
 

   
RSS feed of news items only
I Programmer News
Copyright © 2016 i-programmer.info. All Rights Reserved.
Joomla! is Free Software released under the GNU/GPL License.