How to solve the issue of round number in JavaScript?

Question

I am having an issue in which if I am entering 9 sixteen times and formatting it using `Math.round(9999999999999999)` and it is becoming `10000000000000000`. Oddly enough, when I run `9999999999999999 == 10000000000000000` it evaluates as true. How do I solve this issue?

Answer 1

JavaScript math loses precision very quickly; that's one of the reasons it's hardly ever used in scientific settings. Numbers in JavaScript are 64-bit floating point values (https://www.ecma-international.org/ecma-262/5.1/#sec-8.5), which means numbers must fall between +/- 9007199254740991 or suffer inaccuracies.

For numbers beyond that range, you'll need something other than the JavaScript Number object. A quick Google search for "JavaScript big integer" produces some results, but I'm not familiar enough with any of them to recommend one over another.

Let me know if I can be of more assistance.

Ian