# Naïve global.set question
**URL:** https://discourse.nodered.org/t/naive-global-set-question/51970
**Category:** General
**Created:** [7 October 2021 12:55 UTC](https://discourse.nodered.org/t/naive-global-set-question/51970 "2021-10-07T12:55:16Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@tony1](https://discourse.nodered.org/u/tony1)
#### Post date: [7 October 2021 12:55 UTC](https://discourse.nodered.org/t/naive-global-set-question/51970/1 "2021-10-07T12:55:16Z")
I was wondering how to use global.set properly. It seems like changing the properties of an object brought in by _global.get_ immediately propagates to the global object, without needing to _global.set_, because _global.get_ passes by reference. Is global.set necessary?
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### Author:  [@knolleary](https://discourse.nodered.org/u/knolleary)
#### Post date: [7 October 2021 12:57 UTC](https://discourse.nodered.org/t/naive-global-set-question/51970/2 "2021-10-07T12:57:08Z")
> [@tony1](#):
>
> Is global.set necessary?
By default, context is stored in memory and yes, `get` returns the object without cloning it, so any modifications will be applied to the object still in the context store.
However, if you enable a persistent context store, so the contents are saved in files, you need to use `global.set` in order to tell the store the value has changed and needs saving.
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### Author:  [@tony1](https://discourse.nodered.org/u/tony1)
#### Post date: [7 October 2021 13:02 UTC](https://discourse.nodered.org/t/naive-global-set-question/51970/3 "2021-10-07T13:02:50Z")
Knolleary, thank you.
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### Author:  [@system](https://discourse.nodered.org/u/system)
#### Post date: [6 December 2021 13:03 UTC](https://discourse.nodered.org/t/naive-global-set-question/51970/4 "2021-12-06T13:03:25Z")
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