# What's going on here? (code and errors)
**URL:** https://discourse.nodered.org/t/whats-going-on-here-code-and-errors/95783
**Category:** General
**Created:** [4 March 2025 10:52 UTC](https://discourse.nodered.org/t/whats-going-on-here-code-and-errors/95783 "2025-03-04T10:52:05Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [4 March 2025 10:52 UTC](https://discourse.nodered.org/t/whats-going-on-here-code-and-errors/95783/1 "2025-03-04T10:52:05Z")
I'm stuck on a problem with `context` and and trying to check things.
To that end this is a bit of code I wrote
```auto
let x = context.get("test") || 0;
if (msg.payload == "x")
{
context.set("test",1)
}
else
if (msg.payload == "y")
{
context.set("test",0)
}
let msg.payload = x;
return msg;
```
But I'm seeing/getting errors with the `msg.payload` lines.
Errr..... Why?
See included picture:
---
### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [4 March 2025 10:54 UTC](https://discourse.nodered.org/t/whats-going-on-here-code-and-errors/95783/2 "2025-03-04T10:54:32Z")
Msg is already defined, so no need for the let
---
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [4 March 2025 10:55 UTC](https://discourse.nodered.org/t/whats-going-on-here-code-and-errors/95783/3 "2025-03-04T10:55:35Z")
Thanks.
Shows how bad I've got with being away from coding for a while.
(That solved it.)
(No button to indicate that so sorry.)
---
### Author:  [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)
#### Post date: [4 March 2025 12:26 UTC](https://discourse.nodered.org/t/whats-going-on-here-code-and-errors/95783/4 "2025-03-04T12:26:44Z")
Couple of reminders.
- Use `const` instead of `let` if you aren't going to change a variable.
- Don't use `||` if your context might contain something true/false looking - such as your 0 and 1. Use `??` instead which is safer.
- Be consistent with the use of `;` - either do or don't but preferably don't mix. It will catch you out eventually.
And have fun! 😄
---
### Author:  [@Trying\_to\_learn](https://discourse.nodered.org/u/Trying_to_learn)
#### Post date: [4 March 2025 12:29 UTC](https://discourse.nodered.org/t/whats-going-on-here-code-and-errors/95783/5 "2025-03-04T12:29:38Z")
Yeah, thanks.
That is another thing I need to instil with myself.
But I am (for now) getting rid of all the `var` and making them `let`.
Then I need to check if I can make them `const`.
_(Which I have done with some already.)_
It is just a long painful thing, and I've been out of programming for a few months.
😢
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [18 March 2025 12:30 UTC](https://discourse.nodered.org/t/whats-going-on-here-code-and-errors/95783/6 "2025-03-18T12:30:03Z")
This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.