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Asked: 2026-05-10T13:27:33+00:00

I recently asked a question about IIf vs. If and found out that there

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I recently asked a question about IIf vs. If and found out that there is another function in VB called If which basically does the same thing as IIf but is a short-circuit.

Does this If function perform better than the IIf function? Does the If statement trump the If and IIf functions?

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  1. Damn, I really thought you were talking about the operator all along. 😉 Anyway …

    Does this If function perform better than the IIf function?

    Definitely. Remember, it’s built into the language. Only one of the two conditional arguments has to be evaluated, potentially saving a costly operation.

    Does the If statement trump the If and IIf functions?

    I think you can’t compare the two because they do different things. If your code semantically performs an assignment you should emphasize this, instead of the decision-making. Use the If operator here instead of the statement. This is especially true if you can use it in the initialization of a variable because otherwise the variable will be default initialized, resulting in slower code:

    Dim result = If(a > 0, Math.Sqrt(a), -1.0)  ' versus  Dim result As Double ' Redundant default initialization! If a > 0 Then     result = Math.Sqrt(a) Else     result = -1 End If
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