Retrieving the actual binary value of a JavaScript number value?

Question

In JavaScript, for a given property containing a Number value, is it possible to retrieve the actual binary value - the 64 bits representing the value.

var x = 13;

What 64 bits are stored in the memory location that x points to?

I know that there are IEEE 754 converters out there. But is it possible to retrieve the actual live binary value from the memory cell? BTW, I don't need this for any application, I'm just curious...

Answer 1

(13).toString(2); // => "1101"

Answer 2

See http://stackoverflow.com/questions/3077718/converting-a-decimal-value-to-a-32bit-floating-point-hexadecimal/3117567#3117567, where you can find the code for the 32-bit case. Converting that for the 64-bit case should be really straight-forward.

Well, except for the fact that JavaScript doesn't guarantee you anything about the actual data type that represents a Number, so you might get overflows if your JavaScript implementation only uses 32 bits for representing Numbers.