I am getting MongoDB ObjectIds, which are 12 bytes and their hex string looks like this: 62d34be4f8cd489f6d5b8e0e.

I want to use the object id as a map key like this:

new Map().set(ObjectId('62d34be4f8cd489f6d5b8e0e'),"value")

That doesn't really work because each ObjectId object is unique so two with the same id are not equal objects.

There are a few ways I can think of:

• Use the hex string as map key:

new Map().set("62d34be4f8cd489f6d5b8e0e", "value")

• Use a buffer / Uint8Array, and use some special Map which works with arrays as keys

new Map().set(Buffer.from("62d34be4f8cd489f6d5b8e0e", "hex"), "value")

• Turn the buffer into a 12 byte string which looks like b�K���H�m[�\x0E

new Map().set(Buffer.from("62d34be4f8cd489f6d5b8e0e", "hex").toString(), "value")

• Turn the buffer into a number (this turns a 12 byte buffer into a 16 byte number so it seems a little wierd)

new Map().set(Buffer.from("62d34be4f8cd489f6d5b8e0e", 'hex').readInt16BE(), "value")

Which method has the best performance?