Feature request: xmpz's bit range feature, byte arrays about gmp-wasm HOT 3 CLOSED

Thank you for sharing your ideas!

I started with a mutable wrapper, but I dropped it. It turned out that immutable wrappers have comparable performance, while providing a more JavaScript-friendly API. All of the low-level GMP / MPFR functions are also exposed so those can be used when somebody wants to do advanced optimizations. https://github.com/Daninet/gmp-wasm#advanced-usage. You can even mix the high level wrapper with low level code, by accessing the mpz_t pointer from the wrapper.

"Bit slice" read feature wouldn't be a same as doing a shiftRight() + bitwise and() with a bitmask? I see that GMP has functions for manipulating individual bits, maybe those could be exposed in the wrapper.

I like the idea of byte array I/O. I will try to add it to the next version.

from gmp-wasm.

You could definitely implement bit slicing with shifting and masking. I suppose it might be faster to do all that on the inside and just let me ask for a specific range of bits.

For byte arrays, gmpy gives you a "portable" output with a two byte header. You probably want to be interoperable with that as well as the Java version (no header).

from gmp-wasm.

I added some new Integer functions to version 0.8.2:

setBit(index)
setBits(indices)
clearBit(index)
clearBits(indices)
flipBit(index)
flipBits(indices)
getBit(index)
msbPosition()
sliceBits(start, end) => Works similarly to JS Array.slice(), but on bits. It supports negative offsets.
writeTo(num, offset, bitCount) => Can be used to put an another integer somewhere in the middle of the binary representation
toBuffer(littleEndian = false) => Exports Uint8Array without any extra headers. Sign is not included
toString(radix = 10) has now an optional radix parameter

Uint8Array buffers are also supported by the constructor:
ctx.Integer(ctx.Integer('1234567').toBuffer())

Now it also possible to use create and read strings in arbitrary bases:
ctx.Integer(6).toString(7)
ctx.Integer('110', 2)

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