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Modifying a single element of an array

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Posted on by Josh1

I'm trying to use an array, defined in an Initialize variable as [10,25,86,43,22]. I'd like to be able to modify the individual elements of this array. For instance, how do I increment element 3 by 1, so that the array is now [10,25,87,43,22]?

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v-bacao-msft Microsoft Employee on at

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Hi @Josh1,

There is no direct action and Expression in Flow to change an element of an array currently.

If you want to function that you mentioned to be supported in Microsoft Flow, please submit an idea to Flow Ideas Forum:

https://powerusers.microsoft.com/t5/Flow-Ideas/idb-p/FlowIdeas

In addition, I use a series of variables to change a certain element, the process is more cumbersome, there may be a better way, but you could refer to this method first:

The general idea is to manually add an index to the array, then change the array element corresponding to the specified index, empty the previous array, and add the new element.

Array-Test: the initial array

Array-Index: create an index

Array-Tran: As a transition, store the Test array elements and Index, one-to-one correspondence.

Traverse the array-Tran and add the Value as a new element of the Test array.

If the index is equal to 3, need to add 1 to Value by using add() function.

Image reference:

Apply_to_each:

Apply_to_each 2:

Finally, you could output an array to see if the result is correct.

Please take a try.

Best Regards,

Barry

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Alphie 48 on at

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(4 years later) Is this still the best method to update a single value in an array?

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takolota1 4,980 Moderator on at

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@Josh1 @Alphie @v-bacao-msft

Couldn’t you just use a single compose action & a combination of join( ), take( ), & skip( ) expressions?

So something like
@join(take(InsertArray, 3), ','), InsertNewValue, @join(skip(InsertArray, 4), ',')
inside a Compose action. Then use a split(outputs(‘Compose’), ‘,’) to re-form the array with the new value.

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