What is the most optimal method for converting an untyped array of 32-bit integers into a UInt8Array?

I have a standard JavaScript array filled with valid 32-bit signed integers that I need to convert into a UInt8Array. Take for example this JavaScript array:

[255, 3498766, -99]

The resulting UInt8Array should display the signed 32-bit representation of these numbers:

255     = [0x00, 0x00, 0x00, 0xFF]
3498766 = [0x00, 0x35, 0x63, 0x0E]
-99     = [0xFF, 0xFF, 0xFF, 0x9D]

Therefore, if given an input of [255, 3498766, -99], the output would be:

[0x00, 0x00, 0x00, 0xFF, 0x00, 0x35, 0x63, 0x0E, 0xFF, 0xFF, 0xFF, 0x9D]

While there are more straightforward ways to achieve this task, I am interested in finding the most direct conversion method.

javascripttyped-arrays

Answer №1

x = [127, 5432109, -33]
y = new Uint8Array(Int32Array.from(x).buffer)
console.log(y)

The output will follow the platform byte order, typically LE on modern processors. To achieve big-endian format like in your example, you may need to use DataView.getInt32 and perform additional manipulations (refer to this link for more information).

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