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