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Tip of the Day
Language: Visual Basic
Expertise: Beginner
Aug 1, 1997

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Speed up your Code Using Choose

You can often use Choose to replace an array and build tables of results evaluated at compile-time instead of run time. For instance, if you need to evaluate the factorial of a number in the range 1 to 10, try this function:
 
Function Factorial(number As Integer) _
        As Long
Factorial = Choose(number, 1, 2, 6, _
        24, 120, 720, 5040, 40320, _
        362880, 3628800)
End Function
Francesco Balena
 
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