These are utilities that I use to download files cross-browser. The nifty thing about this is that you can actually set the download property of a link to the name you want your filename to be. FYI the mimeType for binary is application/octet-stream var downloadBlob, downloadURL; downloadBlob = function(data, fileName, mimeType) { var blob, url; … Read more
Typed Arrays were designed by the WebGL standards committee, for performance reasons. Typically Javascript arrays are generic and can hold objects, other arrays and so on – and the elements are not necessarily sequential in memory, like they would be in C. WebGL requires buffers to be sequential in memory, because that’s how the underlying … Read more
You can create a new TypedArray with a new ArrayBuffer, but you can’t change the size of an existing buffer function concatTypedArrays(a, b) { // a, b TypedArray of same type var c = new (a.constructor)(a.length + b.length); c.set(a, 0); c.set(b, a.length); return c; } Now can do var a = new Uint8Array(2), b = … Read more
You can use the set method. Create a new typed array with all the sizes. Example: var arrayOne = new Uint8Array([2,4,8]); var arrayTwo = new Uint8Array([16,32,64]); var mergedArray = new Uint8Array(arrayOne.length + arrayTwo.length); mergedArray.set(arrayOne); mergedArray.set(arrayTwo, arrayOne.length); Alternative: Convert your typed array in “normal” arrays. concat it and create a type array of it again. In … Read more
I prefer the following method function copy(src) { var dst = new ArrayBuffer(src.byteLength); new Uint8Array(dst).set(new Uint8Array(src)); return dst; }
Why not using a Blob ? (I realize it might not have been available at that time). Just create a Blob with your data, like var blob = new Blob([array1,array2,string,…]) and turn it back into an ArrayBuffer (if needed) using a FileReader (see this). Check this : What’s the difference between BlobBuilder and the new … Read more
Use the set method. But note, that you now need twice the memory! var a = new Int8Array( [ 1, 2, 3 ] ); var b = new Int8Array( [ 4, 5, 6 ] ); var c = new Int8Array(a.length + b.length); c.set(a); c.set(b, a.length); console.log(a); console.log(b); console.log(c);
The current behaviour, is determined by the endianness of the underlying hardware. As almost all desktop computers are x86, this means little-endian. Most ARM OSes use little-endian mode (ARM processors are bi-endian and thus can operate in either). The reason why this is somewhat sad is the fact that it means almost nobody will test … Read more
Update 2016 – five years on there are now new methods in the specs (see support below) to convert between strings and typed arrays using proper encoding. TextEncoder The TextEncoder represents: The TextEncoder interface represents an encoder for a specific method, that is a specific character encoding, like utf-8, iso-8859-2, koi8, cp1261, gbk, … An … Read more