12/22/2023 0 Comments 4 byte bit slicer![]() Please note, there’s no constructor called TypedArray, it’s just a common “umbrella” term to represent one of views over ArrayBuffer: Int8Array, Uint8Array and so on, the full list will soon follow. They share the same set of methods and properties. The common term for all these views ( Uint8Array, Uint32Array, etc) is TypedArray. Let view = new Uint32Array(buffer) // treat buffer as a sequence of 32-bit integersĪlert(Uint32Array.BYTES_PER_ELEMENT) // 4 bytes per integerĪlert(view.length) // 4, it stores that many integersĪlert(teLength) // 16, the size in bytesĪlert(num) // 123456, then 0, 0, 0 (4 values total) Let buffer = new ArrayBuffer(16) // create a buffer of length 16 So, the binary data in an ArrayBuffer of 16 bytes can be interpreted as 16 “tiny numbers”, or 8 bigger numbers (2 bytes each), or 4 even bigger (4 bytes each), or 2 floating-point values with high precision (8 bytes each). Float64Array – treats every 8 bytes as a floating point number with possible values from 5.0x10 -324 to 1.8x10 308.That’s called a “32-bit unsigned integer”. Uint32Array – treats every 4 bytes as an integer, with possible values from 0 to 4294967295.That’s called a “16-bit unsigned integer”. Uint16Array – treats every 2 bytes as an integer, with possible values from 0 to 65535.Such value is called a “8-bit unsigned integer”. Uint8Array – treats each byte in ArrayBuffer as a separate number, with possible values from 0 to 255 (a byte is 8-bit, so it can hold only that much).It’s the “eyeglasses” that give an interpretation of the bytes stored in the ArrayBuffer. To manipulate an ArrayBuffer, we need to use a “view” object.Ī view object does not store anything on its own. To access individual bytes, another “view” object is needed, not buffer.ĪrrayBuffer is a memory area.It takes exactly that much space in the memory.It has a fixed length, we can’t increase or decrease it.ArrayBuffer has nothing in common with Array: Let’s eliminate a possible source of confusion.
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