How to remove the last element of an array?

[cchicken]

How would a compose an output to remove the last element of an array? My specific use case would be to remove an extension from a file name..

For example, I have a file name called: this.is.a.test.txt

Desired output: this.is.a.test

Thanks!

[Julien2]

Hi @cchicken ,

This expression might help you:

substring(outputs('Compose'),0,sub(length(outputs('Compose')),4))

I hope it helps!

Regards,

Julien 

[cchicken]

@Julien2 

I think this works. Can you briefly explain how this works? 

Thank you!

[Julien2]

Hi @cchicken ,

The substring function allows extracting part of a string. I have specified where to start at position 0 and how many characters I want.
To find how many characters to take, I have used the length expression to give me the string length for the result.

If I have answered your question, please mark your post as Solved.

Thank you.

[DeepakS · Accepted solution]

Hi @cchicken 

As @Julien2  suggested you should use substring function achieve this, I would prefer to add on the solution is to get the length of the last element dynamically:

MyString is variable storing : this.is.a.test.txt (You can actually use any other string )

substring(variables('MyString'),0,lastIndexOf(variables('MyString'),'.'))

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