# XOR and ADD of the buffer numbers
**URL:** https://discourse.nodered.org/t/xor-and-add-of-the-buffer-numbers/58547
**Category:** General
**Created:** [17 February 2022 17:16 UTC](https://discourse.nodered.org/t/xor-and-add-of-the-buffer-numbers/58547 "2022-02-17T17:16:15Z")
**Posts on this page:** 4
**Page:** 2
### Author:  [@alda](https://discourse.nodered.org/u/alda)
#### Post date: [18 February 2022 14:32 UTC](https://discourse.nodered.org/t/xor-and-add-of-the-buffer-numbers/58547/21 "2022-02-18T14:32:48Z")
I found one more small problem. Main unit isn't accepting when I wll send a object and I must transform back to buffer. ☹
But I hope buffer maker will help
maybe better way is not transfer buffer to bject, but stay with buffer
---
### Author:  [@alda](https://discourse.nodered.org/u/alda)
#### Post date: [18 February 2022 15:29 UTC](https://discourse.nodered.org/t/xor-and-add-of-the-buffer-numbers/58547/22 "2022-02-18T15:29:27Z")
back to my first question. I reworked it to work with buffer.
Is it possible rework this :
```auto
const data = Object.entries(msg.payload);
let ADDS = 0;
let XORS = 0;
for (let index = 0; index < data.length; index++) {
const item = data[index][0];
const value = data[index][1];
if (item === "ADDS") continue; //skip ADDS prop
if (item === "XORS") continue; //skip XORS prop
if (item === "END") continue; //skip END prop
ADDS += value;
XORS ^= value;
}
msg.payload.ADDS = (ADDS ^ 0xAA) & 0xFF;
msg.payload.XORS = (XORS ^ 0xAA) & 0xFF;
return msg;
```
to work with this buffer ?:
I tried this, but result isn't ok:
```auto
let ADDS = 0;
let XORS = 0;
for (let index = 0; index < 15; index++) {
const value = msg.payload.readUInt8(index);
ADDS += value;
XORS ^= value;
}
ADDS = (ADDS ^ 0xAA) & 0xFF;
XORS = (XORS ^ 0xAA) & 0xFF;
msg.payload.writeUInt8(ADDS,12)
msg.payload.writeUInt8(XORS,13)
return msg;
```
---
### Author:  [@alda](https://discourse.nodered.org/u/alda)
#### Post date: [18 February 2022 16:07 UTC](https://discourse.nodered.org/t/xor-and-add-of-the-buffer-numbers/58547/23 "2022-02-18T16:07:36Z")
I got it, problem is buffer length. Not 15 but only 13 🙂
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [19 April 2022 16:08 UTC](https://discourse.nodered.org/t/xor-and-add-of-the-buffer-numbers/58547/24 "2022-04-19T16:08:24Z")
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