javascript - Random floating point double in Inclusive Range

Question

We can easily get random floating point numbers within a desired range [X,Y) (note that X is inclusive and Y is exclusive) with the function listed below since Math.random() (and most pseudorandom number generators, AFAIK) produce numbers in [0,1):

function randomInRange(min, max) {
  return Math.random() * (max-min) + min;
}
// Notice that we can get "min" exactly but never "max".

How can we get a random number in a desired range inclusive to both bounds, i.e. [X,Y]?

I suppose we could "increment" our value from Math.random() (or equivalent) by "rolling" the bits of an IEE-754 floating point double precision to put the maximum possible value at 1.0 exactly but that seems like a pain to get right, especially in languages poorly suited for bit manipulation. Is there an easier way?

(As an aside, why do random number generators produce numbers in [0,1) instead of [0,1]?)

[Edit] Please note that I have no need for this and I am fully aware that the distinction is pedantic. Just being curious and hoping for some interesting answers. Feel free to vote to close if this question is inappropriate.

Answer 1

I believe there is much better decision but this one should work :)

function randomInRange(min, max) {
  return Math.random() < 0.5 ? ((1-Math.random()) * (max-min) + min) : (Math.random() * (max-min) + min);
}