What is Double Precision Float

Question

Double precision floating point numbers?

Answer 1

I think In JavaScript there is no double precision float(I mean like "Double variable;").

just declaring a variable using "var".

JavaScript numbers are always are 64bit(double precision) floating point numbers

Single precision means 32bit.
I think it's based on your system.

https://www.w3schools.com/js/js_numbers.asp