Too late for such changes

perfect !

Can anybody do me a favor? I do understand it is the arrow function and know how it works. But I wonder why it knows the x is equal to a and y is equal to b?

I like this

Seems clean but, I wonder how to do error handling (Unrecognised operation, type checking values and division by 0) in this cleanly too!

i like it very much, thanks

When I ran "Submit" the first time, it came back with 100 fails.
I added some console.logs and re-ran it, it came back all green.
I removed the console.logs and got another 100 fails.
I added the console.logs back in and it completely submitted, without giving me a chance to refactor.

Which is to say, I think the platform itself may be having issues.

Well...I don't know what the name of this trick?

There're already numerous O(n) solutions to the original kata which can be trivially copied from there.

perfect

Add console.info(prev/Math.pow(2,32), prev/Math.pow(2,32) * 26 + 65) in the middle of the the iife's random function, then run it and see if you can figure out what's happening. ;-)

(function () { 
...
  function random() {
    prev = (multiplier * prev + increment) % modulus;
    console.info(prev/Math.pow(2,32), prev/Math.pow(2,32) * 26 + 65)
    return prev/Math.pow(2,32);
  }
...

For example, how exactly does the regular expression test truthy for the smiley ";)"?