How do I create an unsigned integer array of size 128 bits in JavaScript?

Question

I can use Uint8Array for 8 bits, Uint32Array for 32 bits, but I can't find an alternative which allows me to use 128 bits. Is there a computationally and memory efficient way to store such values?

At the moment I'm just approximating it by using an Array, but that appears to be ~5x slower than a Uint32Array.

how about Uint32Array with 4 elements per 128 bit item, similar to how it is done for ImageData.data rgba color values? — le_m
– le_m, Commented May 26, 2017 at 19:36

TheJim01 · Accepted Answer · 2017-05-26 19:47:50Z

2

Typed arrays only go as large as Float64Array. If you need uints, the largest you can get is UInt32Array. If you need 128 bits, you'll need to create logic which can place your bits into a UInt32Array as 4 DWORDs.

Also keep in mind that JavaScript Bitwise Operators only operate at 32-bit, so even if you try to shift the DWORDs of your values to re-assemble your 128-bit number, it will likely truncate your data into nothing.

answered May 26, 2017 at 19:47

TheJim01

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