Looking to combine multiple arraybuffers into a Blob, but facing limitations with TypedArrays that lack handy methods like "push".
For example:
var x = new Int8Array( [ 1, 2, 3 ] );
var y = new Int8Array( [ 4, 5, 6 ] );
The desired outcome is to have [ 1, 2, 3, 4, 5, 6 ].
To achieve this, you can utilize the set method. However, it's essential to keep in mind that this approach will require twice the amount of memory!
var x = new Int8Array( [ 1, 2, 3 ] );
var y = new Int8Array( [ 4, 5, 6 ] );
var z = new Int8Array(x.length + y.length);
z.set(x);
z.set(y, x.length);
console.log(x);
console.log(y);
console.log(z);
To achieve a client-side ~okay solution, you can use the following code:
const x = new Int8Array( [ 1, 2, 3 ] )
const y = new Int8Array( [ 4, 5, 6 ] )
const z = Int8Array.from([...x, ...y])
I frequently utilize the mergeTypedArrays function for combining typed arrays:
function mergeTypedArrays(a, b) {
// Verify both arrays have truthy values
if(!a && !b) throw 'Please provide valid arguments for parameters a and b.';
// Check for truthy values or empty arrays to avoid unnecessary array construction
if(!b || b.length === 0) return a;
if(!a || a.length === 0) return b;
// Ensure both typed arrays are of the same type
if(Object.prototype.toString.call(a) !== Object.prototype.toString.call(b))
throw 'The types of parameters a and b do not match.';
var c = new a.constructor(a.length + b.length);
c.set(a);
c.set(b, a.length);
return c;
}
An unaltered version of the function without null or type checks is as follows:
function mergeTypedArraysUnsafe(a, b) {
var c = new a.constructor(a.length + b.length);
c.set(a);
c.set(b, a.length);
return c;
}
Suppose I have an array of typed arrays
arr = [ ta1, ta2,..... ta100]
I aim to concatenate all subarrays from 1 to 100 into a single 'finalResult' this particular function does the job for me.
single_result_array = mergeArrays(arr)
function mergeArrays(arr) {
// calculating total length of individual arrays
let totalLen = arr.reduce((acc, value) => acc + value.length, 0);
if (!arr.length) return null;
let finalResult = new Uint8Array(totalLen);
// copying each array over to the final result one after another
let len = 0;
for(let ar of arr) {
finalResult.set(ar, len);
len += ar.length;
}
return finalResult;
}
Here is a concise code snippet that can merge multiple arrays with mixed types into a single Int8Array:
let mergedArray = Int8Array.from(Array.prototype.concat(...myArrays.map(array => Array.from(array))));
function mergeArrayBuffers (views: ArrayBufferView[]) {
let totalLength = 0
for (const view of views)
totalLength += view.byteLength
let buffer = new Uint8Array(totalLength)
let position = 0
for (const view of views) {
const uInt8View = new Uint8Array(view.buffer, view.byteOffset, view.byteLength)
buffer.set(uInt8View, position)
position += uInt8View.byteLength
}
return buffer
}
If you're a fan of concise code snippets:
let data = [
new Uint8Array([1, 2, 3]),
new Int16Array([4, 5, 6]),
new Int32Array([7, 8, 9])
];
const mergedUint8Array = new Uint8Array(data.map(array => [...new Uint8Array(array.buffer)]).flat());
Although I appreciate @prinzhorn's solution, I was looking for a more versatile and concise approach:
let arrayA = new Uint8Array([1, 2, 3]);
let arrayB = new Float32Array([4.5, 5.5, 6.5]);
const mergeArrays = (typedArrays, type = Uint8Array) => {
const result = new (type)(typedArrays.reduce((acc, arr) => acc + arr.byteLength, 0));
let offset = 0;
typedArrays.forEach((arr, index) => {
result.set(arr, offset);
offset += arr.byteLength;
});
return result;
}
mergeArrays([arrayA, arrayB], Float32Array)
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