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Random Pin Check

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Posted on by JeremyGibbs

I need to build an app that authenticates users for buying restricted products. Authorised users have got a 4 digit pin number and when they call we need to ask them for 2 of the 4 digits - how can I get an app to randomly ask for 2 digits eg 1 & 2, 2 & 4 etc for each authorisation. I'm fine with the checks to see if the numbers match afterwards but I'm a bit lost on ideas for getting it to ask for 2 random digits.

Ideas please!

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Building Power Apps

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vaubeee 533 on at

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The logic could be:
"First:" & Mid(*PinFromDatasourceAsText*,RandBetween(1,4),1) & " Second:" & Mid(*PinFromDatasourceAsText*,RandBetween(1,4),1)

But still thinking about how to make sure, it`s not the same ... However, this might get you on track 😉
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vaubeee 533 on at

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Maybe this one meets your wish.
Label2 is the PIN from your datasource as text.
To avoid duplicates it's always a combined random of digit 1/2 and 3/4

OnStart or OnSelect of a control:
Set(Random1,RandBetween(1,2));
Set(Random2,RandBetween(3,4));
Set(digit1,Mid(Label2,Random1,1));
Set(digit2,Mid(Label2,Random2,1))

Label for User:
"Please provide digit " & Random1 & " and digit " & Random2

Evaluate
"Digit "& Random1 & " is: " & digit1
"Digit "& Random2 & " is: " & digit2

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JeremyGibbs on at

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Thanks @VauBee, will give it a try! Will confirm when I've tested it.

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JeremyGibbs on at

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Got there with the following, thanks for the help!

ClearCollect(colPinSelection, Shuffle(Sequence(4)));
Set(varRandomPin1, First(colPinSelection).Value);
Set(varRandomPin2, Index(colPinSelection,2).Value)

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vaubeee 533 on at

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👍 Thanks for letting me know. Wasn't aware of Shuffle. Great...

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