Using AND / OR

Questions
1

Hi! Basic question about AND/OR functions within IF node. In this n8n beginner tutorial, why does ‘AND’ work instead of ‘OR’? Even Maxim makes a mistake at first…

If the task is to take a set of e-mails and filter out any that contain “gmail” or “hotmail,” my initial instinct would be to use OR as well.

Thanks!

2

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3

hello @artificialcreative

That’s how the binary logic works.
If you use OR condition, any email will match the filter “NOT gmail OR NOT hotmail IS true”

because a gmail domain will evaluate the statement as “false OR true IS true” which is always true
the same for hotmail domain - "true OR false IS true "

More context is here
Logical disjunction - Wikipedia
Logical conjunction - Wikipedia

1 Like
4

Thanks for the explanation and the Wiki reference - super helpful!

5

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