Creating command flow for Dice Roll

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Posted on by jomaor1

Hello, I'm new to Power Automate and I'm basically trying to create a bot to roll dice in a Group chat.

I got to a point where I'm just stuck, and I got nowhere else to go. This is the Input and Output i want:

Input Message: "/roll d20"

Output Message/Card: "You rolled a 17!"

And I'm just stuck, I had errors to get the message body, but now I'm stuck trying to do rand( 1 , int( slice( messagebody, 8, 3))+1)

Apparently i cannot sum 1 even after i converted the 20 value to an int (because rand() needs to sum+1 so that it can go up to 20)

Any ideas how to fix this? or even how to help me get the correct flow for this?

Thanks!

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David_MA 12,982 Super User 2025 Season 2 on at

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I am not really understanding what you want to do since a traditional six-sided dice has only six values from 1 to 6. How do you roll a 17? Or is that the problem you are having? If so, you can use the following expression to generate a number from 1 to 6:

rand(1,6)

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jomaor1 10 on at

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Hello, thanks for the reply!

Sorry, maybe I wasn't too clear. There are OTHER dice sizes, so if the user types /roll d20, it should roll a dice with 20 sides. Which is very common in RPGs settings (DnD).

Another problem is that you stated that rand(1,6) returns 1 through 6. This is incorrect, the function will return between 1 and 5. So I always need to sum 1 to the dice size the user chose.

That's why it should be rand( 1, user_size + 1)

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David_MA 12,982 Super User 2025 Season 2 on at

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I don't think I am wrong with regard to rand(1,6) returning 1, 2, 3, 4, 5, and 6, but let's say I am. In that case, change the expression to rand(1,7). Then for your 20-sided dice, use rand(1,21)

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jomaor1 10 on at

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Hello! 2 things:

1 - Just ran a test with just a loop of 50 rand(1,6) and got 0 6's. So I need to sum 1 to the number.
2 - The dice number is variable and should be chosen by the user. So I cannot just go with 1 IF() to see if it's 6 sided or 20 sided...

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David_MA 12,982 Super User 2025 Season 2 on at

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If the user is choosing how many sides the die has, use this expression:

rand(1,add(int(triggerBody()['number']),1))

You will replace triggerBody()['number'] with the dynamic content provided by the user.

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CU27110513-0 2 on at

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I’ve messed around with this kind of thing before, and yeah, getting it to work can be a bit of a pain. The issue is that rand() doesn’t include the upper number unless you bump it up by 1. What worked for me was using something like this:
rand(1, add(int(slice(triggerBody()['messagebody'], 8, 3)), 1))
Basically, it grabs the number of sides (like the 20 from /roll d20), turns it into an integer, and adds 1 so it rolls the full range.
If you want to double-check that it’s rolling properly, you could test it with a dice simulator first to make sure the numbers feel right.

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Chriddle 8,443 Super User 2025 Season 2 on at

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> Just ran a test with just a loop of 50 rand(1,6) and got 0 6's. So I need to sum 1 to the number.

Just read the documentation ;)

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