Increment variable by 1

[bigdata...@gmail.com]

Hi All,

How to increment the variable by 1 in nodered. It has to increment the value when the new document is added in Cloudant NoSQL.

Can any one please help me out in writing the function.

Regards,

Divya.

[Nick O'Leary]

Hi,

In JavaScript, you increment a value by:

var i=0;

i = i+1;

which answers the question you've asked, but probably doesn't help you achieve what you want.

What does the message look like?  What value do you want to increment?

Nick

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[bigdata...@gmail.com]

Thanks for reply.

How to print the value by incrementing on the debug console.

Regards,

Divya

On Monday, March 20, 2017 at 5:43:36 PM UTC+5:30, Nick O'Leary wrote:

Hi,

In JavaScript, you increment a value by:

var i=0;

i = i+1;

which answers the question you've asked, but probably doesn't help you achieve what you want.

What does the message look like?  What value do you want to increment?

Nick

On 20 March 2017 at 12:07, <bigdata...@gmail.com> wrote:

Hi All,

How to increment the variable by 1 in nodered. It has to increment the value when the new document is added in Cloudant NoSQL.

Can any one please help me out in writing the function.

Regards,

Divya.

--
http://nodered.org
 
Join us on Slack to continue the conversation: http://nodered.org/slack
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To unsubscribe from this group and stop receiving emails from it, send an email to node-red+u...@googlegroups.com.

[Nick O'Leary]

>How to print the value by incrementing on the debug console.

Please answer my questions: What does the message look like?  What value do you want to increment?

Nick

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[bigdata...@gmail.com]

ok. We are getting the real time data. I want to save the data by assigning the starting with value 1. When the next data entered it should save with value 2 and so on.

[Nick O'Leary]

> ok. We are getting the real time data. I want to save the data by assigning the starting with value 1. When the next data entered it should save with value 2 and so on.

So you want to add a property to your message that represents a count of how many messages have been received so far?

Have a look at http://flows.nodered.org/node/node-red-contrib-counter

Nick

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[bigdata...@gmail.com]

Yes Nick Exactly...

[ma...@jasspro.it]

Hello

I'm trying to increment a variable by 1 every time that read a string.

My code is :

var counter;
if (msg.topic === "IN1ON") {
    counter = counter +1;
}

    if (counter == 10) {
                       counter=0;
                       return "value10";
                        }

return null;

But I didn't rean anything

Do you know why ?

Thanks

[Mark Setrem]

So there are several things that make your flow not work
1) In Node-RED the nodes have no memory of previous messages. So every time your function node gets a message counter is 0

2) You need to return an object not a variable

You can find out how to store a variable so that part 1 works here: https://nodered.org/docs/writing-functions#storing-data

The docs have some examples of writing flows and there’s also several online Node-RED tutorials that will show you how to structure a function node in Node-RED