Maximus - 8 months ago 13

Javascript Question

Javascript stores all numbers as double-precision 64-bit format IEEE 754 values according to the spec:

The Number type has exactly 18437736874454810627 (that is, 2^{64}−2^{53}+3)

values, representing the double-precision 64-bit format IEEE 754

values as specified in the IEEE Standard for Binary Floating-Point

Arithmetic

Is there any way to see the number in this form in Javascript?

Answer

You can use typed arrays to examine the raw bytes of a number. Create a `Float64Array`

with one element, and then create a `Uint8Array`

with the same buffer. You can then set the first element of the float array to your number, and examine the bytes via the `Uint8Array`

. You'll have to do some shifting and combining for the various pieces of the number of course, but it's not hard.

There are no built-in facilities to do things like extract the exponent.