Add Shuffle Deck app specification Resolves: N/a See also: N/apull/59/head
jdmedlock
6 years ago
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# Shuffle Card Deck
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**Tier:** 3-Advanced
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As a Web Developer you'll be asked to come up with innovative applications that
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solve real world problems for real people. But something you'll quickly learn
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is that no matter how many wonderful features you pack into an app users won't
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use it if it isn't performant. In other words, there is a direct link between
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how an app performs and whether users percieve it as usable.
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The objective of the Shuffle Card Deck app is to find the fastest technique for
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shuffling a deck of cards you can use in game apps you create. But, more
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important it will provide you with experience at measuring and evaluating app
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performance.
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Your task is to implement the performance evaluation algorithm, the Xorshift
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pseudorandom number generator, as well as the WELL512a.c algorithm if you
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choose to attempt the bonus feature.
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## User Stories
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- [ ] User can see a panel containing a text box the user can enter the
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number of rounds into, three output text boxes to contain the starting time,
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ending time, and total time of the test, and two buttons - 'JS Random',
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'Xorshift'.
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- [ ] User can enter a number from 1 to 10,000 to specify the number of
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times (or rounds) the selected random number is to be executed.
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- [ ] User can click one of the three buttons to start the evaluation of the
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selected random number algorithm. The random number algorithm will be executed
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for the number of rounds entered by the user above.
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- [ ] User can see a warning message if number of rounds has not been entered,
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if it is not within the range 1 to 10,000, or if it is not a valid integer.
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- [ ] User can see a tabular output area where the results of each algorithm
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are displayed - algorithm name, time started, time ended, and total time.
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- [ ] User can see a warning dialog with a 'Cancel' and a 'OK' button if the
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number of rounds is changed before all three tests have been run.
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- [ ] User can click the 'Cancel' button in the warning dialog to dismiss
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the dialog with no changes.
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- [ ] User can click the 'OK' button in the warning dialog to clear the
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output area and close the warning dialog.
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## Bonus features
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- [ ] User can see a third algorithm button - 'WELL512a.c'.
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- [ ] Developer should review the output and determine why the fastest
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algorithm is faster than the slowest algorithm.
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## Useful links and resources
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- [Random Number Generation (Wikipedia)](https://en.wikipedia.org/wiki/Random_number_generation)
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- [Math.random (MDN)](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Math/random)
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- [Xorshift (Wikipedia)](https://en.wikipedia.org/wiki/Xorshift)
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- [WELL512a.c](http://www.iro.umontreal.ca/~panneton/well/WELL512a.c)
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- [console.time (MDN)](https://developer.mozilla.org/en-US/docs/Web/API/Console/time)
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- [Using the Chrome DevTools Audit Feature to Measure and Optimize Performance (Part 1)](https://medium.com/chingu/using-the-chrome-devtools-audit-feature-to-measure-and-optimize-performance-part-1-868a20bbfde8)
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- [Using the Chrome DevTools Audit Feature to Measure and Optimize Performance (Part 2)](https://medium.com/chingu/using-the-chrome-devtools-audit-feature-to-measure-and-optimize-performance-part-2-af4a78bc6cf0)
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## Example projects
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Add one or more examples of projects that have similar functionalities to this application. This will act as a guide for the developer.
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