Generating Uniform Distribution Using Math.random()

In the MDN Math.random web page the comment for the example function getRandomInt(..) says that Math.round() was not used since it gives non-uniform distribution, which implies usi

Solution 1:

You increment your counter using a. The result of the counter would be a*<actual frequency>.

If you increment with 1, you will see that it actually has a uniform distribution.

if (typeof data[a] === 'undefined') { // first time initializedata[a] = 1;
} else {
    data[a] = data[a] + 1;
}

http://jsfiddle.net/hd9tt509/1/