How to limit the buffer by bytes and write only to the first byte?

Question

Node.js

In bl.append(Buffer.alloc(2, [34], 'hex'))I want to write 1 byte 22, and leave the rest empty. It should turn out like this 22 00 , but I can’t figure out how to do it.

bl.append(Buffer.from([ obj.header ])) // Тег
bl.append(Buffer.alloc(2, [34], 'hex'))

Found a way just like this, but it doesn't work

a = Buffer.alloc(2)
a[1] = [34]

Answer 1

Buffer.concat([Buffer.from('22'), Buffer.alloc(hop empty nada)])