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How to check i if any element of array is in another array?

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Posted on by JustusCk

I have an array with old emails and an array with new emails i want to check if any old email is in the array of the new emails. How can i do that i dont have any ideaq

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Building flows

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v-yetonggu-msft on at

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Hi @JustusCk ,

Could you please upload screenshots of the contents of your two arrays?

If possible, I can help you build a flow to check whether the elements of the old email array are in the new email array.

Best Regards,

Sunshine Gu

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JustusCk 71 on at

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Yes ofcourse. Thank you

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v-yetonggu-msft on at

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Hi @JustusCk ,

Please check this test:

item() items('Apply_to_each') length(body('Filter_array'))

Best Regards,

Sunshine Gu

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Robby_WW 115 on at

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this is also an option.

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JustusCk 71 on at

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Thank you for the quick answer but what do you put in the Condition if yes or if no?

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Chriddle 8,443 Super User 2025 Season 2 on at

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There is a function for this: intersection([<collection1>], [<collection2>], ...)

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v-yetonggu-msft on at

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Hi @JustusCk ，

This is something you should think about yourself.

For example, when turning to 'Yes' branch, you want to put the union emails of the two arrays into a new array variable, or turning to 'No' branch to exclude the old email address from the new email address.

My Flow:

item() length(body('Filter_array'))

Best Regards,

Sunshine Gu

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