Concatenating Typed Arrays
Typed Arrays don’t have a method concat()
, like Arrays do. The work-around is to use the method
typedArray.set(arrayOrTypedArray, offset=0)
That method copies an existing Typed Array (or normal Array) into typedArray
at index offset
. Then you only have to make sure that typedArray
is big enough to hold all (Typed) Arrays you want to concatenate:
function concatenate(resultConstructor, ...arrays) {
let totalLength = 0;
for (let arr of arrays) {
totalLength += arr.length;
}
let result = new resultConstructor(totalLength);
let offset = 0;
for (let arr of arrays) {
result.set(arr, offset);
offset += arr.length;
}
return result;
}
console.log(concatenate(Uint8Array,
Uint8Array.of(1, 2), Uint8Array.of(3, 4)));
// Uint8Array [1, 2, 3, 4]
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