Sum 2 nodes in a function

General
1

hello all,
I have tried in different ways to add 2 numbers in a function. I can not do it.
I also have very little experience with functions in Nodende.
Who wants to help me get this done.

Thankx,
Peter

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2

Your flow does not work when imported. Export your flow again and follow these steps:

In order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)

``` 
   code goes here 
```

You can edit and correct your post by clicking the pencil :pencil2: icon.

See this post for more details - How to share code or flow json

3 
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4

This is not how context works. See documentation.

But if you are always expecting 2 messages from 2 different topics, it is probably easier to use a join node instead, which can combine the 2 topics into a single message (note that this is based on the assumption that you actually always receive 2 messages)

image
image970×1054 63.5 KB

5

I think your function returns wrongly.
Try this function:

context.node1 = context.node1 || 0;
context.node2 = context.node2 || 0;

if(msg.topic == 'node1'){
    context.node1 = msg.payload;
} else if (msg.topic == 'node2') {
    context.node2 = msg.payload; 
}

var c = context.node2 + context.node1;

msg.payload = c;
return msg;

image
image1610×238 22.8 KB 

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Caveat: It will return for every incoming messages, regardless if node1 or node2 were sent ever.

6

Thanx for you reply. Your code is working fine. It helped me a lot.
:+1:

7

Your option with the join option is also working fine. Thankx
:+1:

8

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