Javascript

Question

In a lesson they included this sentence as a note:

"JavaScript numbers are always stored as double precision floating point numbers."

So I don't really get it what they mean by "double precision floating point"

Comments sections are confusing there 😞

It would be amazing if someone explains it😁

Thank you for spending your time!
Lesson (section 2)👇
https://www.sololearn.com/learn/JavaScript/1129/

Answer 1

That would mean it uses 8 bytes for integer and non-integer numbers. Other languages like C, Java etc. also have the less precise (4 byte) single precision floating point numbers which JS doesn't.

Answer 2

A double-precision floating point number is a floating point number with the size of 8 bytes. Basically floating point is a number that can store fractional value, like 1.37, 0.153, 82.17, and so on. So, basically, floating point is a real number, not just an integer, and the double precision is used to indicate it's size, which is 8 bytes
You can refer to
https://en.m.wikipedia.org/wiki/Floating-point_arithmetic
https://en.m.wikipedia.org/wiki/Double-precision_floating-point_format

Answer 3

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