Convert TypedArray to ArrayBuffer
The buffer property of a TypedArray is the underlying ArrayBuffer. A TypedArray can be a view of a slice of that buffer, so the sizes may differ. Access it with arr.buffer.
binary-data/conversion
31 notes, read out of this brain and free to use. Each one was extracted from a source and is re-checked against its exam.
Convert TypedArray to DataView
To create a DataView over the same byte range as a TypedArray: new DataView(arr.buffer, arr.byteOffset, arr.byteLength);
Convert TypedArray to Buffer
To convert a TypedArray to Buffer: Buffer.from(arr);
Convert TypedArray to string
To convert a TypedArray to string as UTF-8: new TextDecoder().decode(arr);
Convert TypedArray to number array
To convert a TypedArray to a number array: Array.from(arr);
Convert TypedArray to Blob
To convert a TypedArray to Blob (only if arr is a view of its entire backing TypedArray): new Blob([arr.buffer], { type: "text/plain" });
Convert TypedArray to ReadableStream
To convert a TypedArray to ReadableStream: new ReadableStream({ start(controller) { controller.enqueue(arr); controller.close(); } });. For chunked streaming, split the TypedArray into chunks: new ReadableStream({ start(controller) { for (let i = 0; i < arr.length; i += chunkSize) { controller.enqueue(arr.slice(i, i + chunkSize)); } controller.close(); } });
Convert DataView to ArrayBuffer
To get the underlying ArrayBuffer from a DataView: view.buffer;
Convert DataView to TypedArray
To convert a DataView to TypedArray, only works if the byteLength of the DataView is a multiple of the BYTES_PER_ELEMENT of the TypedArray subclass. Examples: new Uint8Array(view.buffer, view.byteOffset, view.byteLength); new Uint16Array(view.buffer, view.byteOffset, view.byteLength / 2); new Uint32Array(view.buffer, view.byteOffset, view.byteLength / 4);
Convert DataView to string
To convert a DataView to string as UTF-8: new TextDecoder().decode(view);
Convert DataView to number array
To convert a DataView to a number array: Array.from(view);
Convert Buffer to ArrayBuffer
To get the underlying ArrayBuffer from a Buffer: buf.buffer;
Convert Buffer to TypedArray
To convert a Buffer to TypedArray: new Uint8Array(buf);
Convert Buffer to DataView
To convert a Buffer to DataView: new DataView(buf.buffer, buf.byteOffset, buf.byteLength);
Convert Buffer to string
To convert a Buffer to string: buf.toString(); converts as UTF-8. buf.toString("base64"); converts as base64. buf.toString("hex"); converts as hex.
Convert Buffer to number array
To convert a Buffer to a number array: Array.from(buf);
Convert Buffer to Blob
To convert a Buffer to Blob: new Blob([buf], { type: "text/plain" });
Convert Buffer to ReadableStream
To convert a Buffer to ReadableStream: new ReadableStream({ start(controller) { controller.enqueue(buf); controller.close(); } });. For chunked streaming: new ReadableStream({ start(controller) { for (let i = 0; i < buf.length; i += chunkSize) { controller.enqueue(buf.slice(i, i + chunkSize)); } controller.close(); } });
Convert Blob to TypedArray
To convert a Blob to TypedArray: await blob.bytes();
Convert Blob to DataView
To convert a Blob to DataView: new DataView(await blob.arrayBuffer());
Convert Blob to Buffer
To convert a Blob to Buffer: Buffer.from(await blob.arrayBuffer());
Convert Blob to string
To convert a Blob to string as UTF-8: await blob.text();
Convert Blob to number array
To convert a Blob to a number array: Array.from(await blob.bytes());
Convert ReadableStream to Uint8Array
To convert a ReadableStream to Uint8Array using Bun function: Bun.readableStreamToBytes(stream);. Alternatively with Response: new Response(stream).bytes();
Convert ReadableStream to TypedArray
To convert a ReadableStream to TypedArray using Bun function: new Int8Array(Bun.readableStreamToArrayBuffer(stream));. Alternatively with Response: const buf = await new Response(stream).arrayBuffer(); new Int8Array(buf);
Convert ReadableStream to DataView
To convert a ReadableStream to DataView using Bun function: new DataView(Bun.readableStreamToArrayBuffer(stream));. Alternatively with Response: const buf = await new Response(stream).arrayBuffer(); new DataView(buf);
Convert ReadableStream to Buffer
To convert a ReadableStream to Buffer using Bun function: Buffer.from(Bun.readableStreamToArrayBuffer(stream));. Alternatively with Response: const buf = await new Response(stream).arrayBuffer(); Buffer.from(buf);
Convert ReadableStream to string
To convert a ReadableStream to string as UTF-8 using Bun function: await Bun.readableStreamToText(stream);. Alternatively with Response: await new Response(stream).text();
Convert ReadableStream to number array
To convert a ReadableStream to a number array using Bun function: Array.from(new Uint8Array(Bun.readableStreamToArrayBuffer(stream)));. Alternatively with Response: const arr = await new Response(stream).bytes(); Array.from(arr);
Convert ReadableStream to chunk array
To resolve a ReadableStream to an array of its chunks, where each chunk may be a string, typed array, or ArrayBuffer: Bun.readableStreamToArray(stream);
Convert ReadableStream to Blob
To convert a ReadableStream to Blob: new Response(stream).blob();