I created an array buffer by
var uni = new Uint8Array([255, 216, 255, 0, 0, 0, 0, 0])
But when I try to get back the bytes using map
uni.map(byte => byte.toString(16))
it returns
Uint8Array(8) [0, 0, 0, 0, 0, 0, 0, 0]
Unable to get Uint8Array bytes
Viewed 274
2 Answers
You have to convert TypedArray to Array first:
Array.prototype.slice.call(uni).map(byte=>byte.toString(16))
The Uint8Array can only contain 8-bit unsigned integers (integers between 0 and 255). When you use the Uint8Array.protoype.map() method, trying to transform each element into a string, they get out of the [0, 255] range and are set to 0.
If you want to transform them into strings, you first transform the Uint8Array into a normal Array and them use the Array.prototype.map():
const array = Array.from(uni)
array.map(byte => byte.toString(16))
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