Math.random()?This is just a quick experiment to test if Math.random() implemented in Node.js/V8 is actually as random as it should be. The following code is used to "roll a dice" a hundred thousand times per second. The results can be observed in the table below.
Math.floor(Math.random() * 6) + 1
Using Node.js 22.14.0 with version 12.4.254.21-node.22 of V8 JavaScript engine. (Running on Linux 6.14.2)
Interesting fact: Currently, the longest observed streak of subsequent rolls of six this application has seen is 16. The theoretical probability of that happening is 1 out of 2,821,109,907,456. The theoretical probability of 17 subsequent rolls of six is 1 out of 16,926,659,444,736. That is yet to be observed by this application.
| Result | Number of occurrences | % (Should be around 16.67%) |
|---|---|---|
| 1 | 438,161,000,025 | 16.67% |
| 2 | 438,161,419,950 | 16.67% |
| 3 | 438,160,563,942 | 16.67% |
| 4 | 438,161,122,931 | 16.67% |
| 5 | 438,160,476,066 | 16.67% |
| 6 | 438,160,276,663 | 16.67% |
| Total | 2,628,964,859,577 | 100 % |