# Modify "function node" to create "Loop"
**URL:** https://discourse.nodered.org/t/modify-function-node-to-create-loop/36750
**Category:** General
**Created:** [30 November 2020 10:58 UTC](https://discourse.nodered.org/t/modify-function-node-to-create-loop/36750 "2020-11-30T10:58:22Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@seyeon](https://discourse.nodered.org/u/seyeon)
#### Post date: [30 November 2020 10:58 UTC](https://discourse.nodered.org/t/modify-function-node-to-create-loop/36750/1 "2020-11-30T10:58:22Z")
```auto
[{"id":"7401e57d.659e4c","type":"function","z":"f5d4feda.70164","name":"dimming","func":"x = msg.payload\nfor(var x=50; x<=255; x++)\n{\n node.send({\"bright\":x})\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","x":440,"y":260,"wires":[["4bb6c99b.16b0b8"]]},{"id":"4bb6c99b.16b0b8","type":"delay","z":"f5d4feda.70164","name":"","pauseType":"rate","timeout":"1","timeoutUnits":"seconds","rate":"1","nbRateUnits":"0.05","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":670,"y":260,"wires":[["f888b1de.2446a"]]},{"id":"f888b1de.2446a","type":"change","z":"f5d4feda.70164","name":"bright to payload","rules":[{"t":"move","p":"bright","pt":"msg","to":"payload","tot":"msg"}],"action":"","property":"","from":"","to":"","reg":false,"x":890,"y":260,"wires":[["451189b4.7844f8"]]},{"id":"451189b4.7844f8","type":"debug","z":"f5d4feda.70164","name":"bright","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","statusVal":"","statusType":"auto","x":1090,"y":260,"wires":[]},{"id":"dd723f23.5e6c3","type":"inject","z":"f5d4feda.70164","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"50","payloadType":"num","x":290,"y":260,"wires":[["7401e57d.659e4c"]]},{"id":"413d0494.b8896c","type":"function","z":"f5d4feda.70164","name":"dimming","func":"x = msg.payload\nfor(var x=255; x>=50; x--)\n{\n node.send({\"bright\":x})\n}","outputs":1,"noerr":0,"initialize":"","finalize":"","x":440,"y":320,"wires":[["4bb6c99b.16b0b8"]]},{"id":"f15efa87.c3bb28","type":"inject","z":"f5d4feda.70164","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"255","payloadType":"num","x":290,"y":320,"wires":[["413d0494.b8896c"]]}]
```
There are two inject node(50, 255).
When "50" is entered,
> x = msg.payload
> for(var x=50; x\<=255; x++)
> {
> node.send({"bright":x})
> }
When "255" is entered,
> x = msg.payload
> for(var x=255; x\>=50; x--)
> {
> node.send({"bright":x})
> }
Function node activates.
**I want to repeat the last message on the node until the other data comes in.**
**(For example, input "50" -\> function node ( x=50; x\<=255; x++ ) -\> Repeat "255"(last message) indefinitely until new "255" is entered.)**
Which node should I add? loop? repeat?
Or how should I modify the function node?
---
### Author:  [@Colin](https://discourse.nodered.org/u/Colin)
#### Post date: [30 November 2020 11:25 UTC](https://discourse.nodered.org/t/modify-function-node-to-create-loop/36750/2 "2020-11-30T11:25:25Z")
If you just want to keep repeating the previous message then you can do that with a Trigger node configured like this.
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [14 December 2020 11:25 UTC](https://discourse.nodered.org/t/modify-function-node-to-create-loop/36750/3 "2020-12-14T11:25:37Z")
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