# Global.get('')||0 inconsistent resutls (Function node)
**URL:** https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457
**Category:** General
**Created:** [1 October 2022 15:21 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457 "2022-10-01T15:21:24Z")
**Posts on this page:** 16
**Page:** 1
### Author:  [@edterbak](https://discourse.nodered.org/u/edterbak)
#### Post date: [1 October 2022 15:21 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/1 "2022-10-01T15:21:24Z")
Hello everyone,
Im using Function node a lot.
But I am seeing irratic behaviour of node red. Atleast thats how I percieve it. Might be due to a lack of understading 🙂
```auto
var nr_corr = global.get('NightReduction_current_value',"file");
msg.payload = nr_corr;
return msg;
```
Debug node after and inject node in front shows this produces value 0. As expected. It is also the stored value.
If I want to have a default value of 10 when the variable is undefined, I was thinking that adding "||10 " would be enough. like below
```auto
var nr_corr = global.get('NightReduction_current_value',"file")||10;
msg.payload = nr_corr;
return msg;
```
I expect it to produce 0 now. Because the value is known as shown in the first example.
But the debug node shows value 10 instead.
Is there something I am missing?
This behaviour is sometimes there, sometimes not.
Im currently using NodeRed version 3.0.2
many thanks in advance 😄
---
### Author:  [@jbudd](https://discourse.nodered.org/u/jbudd)
#### Post date: [1 October 2022 15:27 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/2 "2022-10-01T15:27:55Z")
Maybe you need to use persistent context?
[https://discourse.nodered.org/t/a-guide-to-understanding-persistent-context/4115](https://discourse.nodered.org/t/a-guide-to-understanding-persistent-context/4115)
---
### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [1 October 2022 15:29 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/3 "2022-10-01T15:29:29Z")
The number 0 is considered false, so if you you fetch `0` the or would kick in, as it is considered false.. Therefore it defaults to 10.
You will need to use if else conditional to set a default. If `undefined`
---
### Author:  [@edterbak](https://discourse.nodered.org/u/edterbak)
#### Post date: [1 October 2022 15:33 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/4 "2022-10-01T15:33:00Z")
So you are saying that every variable I have declared in global.set ("file") that might be set to the value 0 at some time, will always be showing the ||10 \>\> value 10 as result ??
whuuuuht? 😃
---
### Author:  [@edterbak](https://discourse.nodered.org/u/edterbak)
#### Post date: [1 October 2022 15:33 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/5 "2022-10-01T15:33:48Z")
I am using persistent storage. But I use global variables. I work with multiple tabs. big flows. Thats why I use global instad of flow or context.
---
### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [1 October 2022 15:35 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/6 "2022-10-01T15:35:16Z")
> [@edterbak](#):
>
> So you are saying that every variable I have declared in global.set ("file") that might be set to the value 0 at some time, will always be showing the ||10 \>\> value 10 as result ??
Yes, That's what i am saying. ( would have stopped at Yes but min 10 characters)
---
### Author:  [@edterbak](https://discourse.nodered.org/u/edterbak)
#### Post date: [1 October 2022 15:36 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/7 "2022-10-01T15:36:16Z")
You will need to use if else conditional to set a default. If `undefined`
OK. 😵💫
I have just done this ||0 at multiple places, becasue I thought it was a better and shorter way of testing if the variable exists. hahahaha..
---
### Author:  [@edterbak](https://discourse.nodered.org/u/edterbak)
#### Post date: [1 October 2022 15:37 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/8 "2022-10-01T15:37:54Z")
Thank you all for the quick reply!! Much appreciated. 🙂
---
### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [1 October 2022 15:39 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/9 "2022-10-01T15:39:02Z")
` || 0` is fine but not any other number, unless there will never be a `0`.
---
### Author:  [@jbudd](https://discourse.nodered.org/u/jbudd)
#### Post date: [1 October 2022 15:40 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/10 "2022-10-01T15:40:40Z")
> [@E1cid](#):
>
> The number 0 is considered false, so if you you fetch `0` the or would kick in, as it is considered false.. Therefore it defaults to 10.
> You will need to use if else conditional to set a default. If `undefined`
Hmm. Is that one of those non-positive undocumented features?
It's a bit of a landmine when a variable might validly acquire a value of 0.
So we should never use **context.get('variable') || default\_number**?
---
### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [1 October 2022 15:42 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/11 "2022-10-01T15:42:11Z")
> [@jbudd](#):
>
> So we should never use **context.get('variable') || default\_number**?
see above [post](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/9)
---
### Author:  [@edterbak](https://discourse.nodered.org/u/edterbak)
#### Post date: [1 October 2022 15:47 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/12 "2022-10-01T15:47:18Z")
```auto
var ___test = global.get('___testvalue0')||10;
msg.payload = ___test;
return msg;
```
Result = 10
```auto
var ___test = global.get('___testvalue1')||10;
msg.payload = ___test;
return msg;
```
Result = 1
E1cid is 100% correct. Thank you for this clarity.
@E1cid So any stored value in context/flow/global is subjected to this logic right?
|| is never a solution to check if the varible exists/undefined.
---
### Author:  [@edterbak](https://discourse.nodered.org/u/edterbak)
#### Post date: [1 October 2022 15:50 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/13 "2022-10-01T15:50:47Z")
Just as a sneaky note:
The only case you can use || to do this, is when you have ||0
Hahaha..
If the value is 0, it will be set to 0
if the value is undefined, it will be set to 0 as well 😃
---
### Author:  [@E1cid](https://discourse.nodered.org/u/E1cid)
#### Post date: [1 October 2022 15:56 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/14 "2022-10-01T15:56:19Z")
> [@edterbak](#):
>
> So any stored value in context/flow/global is subjected to this logic right?
Any variable, not just context. This is the Javascript logic
> **[Logical OR (||) - JavaScript | MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Logical_OR#description)**
>
> The logical OR (||) (logical disjunction) operator for a set of operands
> is true if and only if one or more of its operands is true. It is typically used with
> boolean (logical) values. When it is, it returns a Boolean value. However,
> the ||...
> **[Falsy - MDN Web Docs Glossary: Definitions of Web-related terms | MDN](https://developer.mozilla.org/en-US/docs/Glossary/Falsy)**
>
> A falsy (sometimes written falsey) value is a value that is considered false when encountered in a Boolean context.
> [@edterbak](#):
>
> Just as a sneaky note:
>
> The only case you can use || to do this, is when you have ||0
> Hahaha..
> If the value is 0, it will be set to 0
> if the value is undefined, it will be set to 0 as well 😃
@edterbak see post [above](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/9)
---
### Author:  [@edterbak](https://discourse.nodered.org/u/edterbak)
#### Post date: [1 October 2022 16:02 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/15 "2022-10-01T16:02:13Z")
After reading the links you gave, I **think** I am right. that I CAN only use the "||0".
Can you confirm that?
In general, I store global varibles. numbers a lot. So in that case 0 would still produce 0 right?
(Difficult matter this is 🙂 )
And again E1cid! thank you very much in sharing your knowledge
---
### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [15 October 2022 16:02 UTC](https://discourse.nodered.org/t/global-get-0-inconsistent-resutls-function-node/68457/16 "2022-10-15T16:02:21Z")
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