ArrayBuffer converts to zero'd out Uint8Array

Question

I'm trying to convert an array buffer to a Uint8Array and it alwasy comes out as zeros.

buff = new ArrayBuffer(4)
buff[0] = 10
buff[1] = 10
buff[2] = 10
buff[3] = 10
console.log(new Uint8Array(buff))
 -> Uint8Array(4) [0, 0, 0, 0]

Gabriele Petrioli · Accepted Answer · 2020-01-08 18:24:42Z

2

Quoting the docs at ArrayBuffer

You cannot directly manipulate the contents of an ArrayBuffer; instead, you create one of the typed array objects or a DataView object which represents the buffer in a specific format, and use that to read and write the contents of the buffer.

answered Jan 8, 2020 at 18:24

Gabriele Petrioli

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3 Comments

Dellowar Over a year ago

So let's say the array buffer is provided to me via xmlhttp.response, how would I convert it to a uint8array?

Gabriele Petrioli Over a year ago

@SanchkeDellowar The conversion you do is valid, but you cannot alter the values of the buffer directly.

Gabriele Petrioli Over a year ago

@SanchkeDellowar although keep in mind that it is not really a conversion, it is merely a view-as

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