Comparing buffer

General
1

Hi,

How do you compare two buffers (using a function node)?

const decs1 = [3, 1, 1]
const buffer1 = Buffer.from(decs1);

const decs2 = [3, 1, 1]
const buffer2 = Buffer.from(decs2);

if (buffer1 != buffer2){
    msg.payload = 'true'
    return msg
} else{
    msg.payload = 'false'
    return msg
}
2

I think you have the right idea.

But you need to clarify how this is being triggered.
Usually the incoming message contains the things to be compared.
Changing a property defines if it is 1 or 2.

decs2 seems to get the values.
But how that works is way above my head.

3

Google, or your favourite search engine, is often the easiest way to get answers to such questions. Then look for the w3schools or MDN link there if there is one.

1 Like
4

Thank you @Colin

Just a bit confusing as if the statement is true it returned 0 and false it is 1, but nether the less a comparison and you can work with that.

5

It may return 1 or -1 if not equal, so in you case test for 0 or not zero. The reason for +-1 is so that buffers can be sorted into order.

1 Like
6

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