I use the Echo[] function in order to help debug my code. However, I don’t always want to execute an Echo[x] where x might be a variable (or expression) of interest. With that goal in mind, I created the function If[flag == True, myEcho[x_] := If[myEchoFlag, Echo[x]], myEcho[x_] := Nothing; …

Here is my attempt. The sample code with embedded Echo is this: Module[{}, x = Sqrt[2]; If[myEchoQ, Echo[x]]; N[x]] The flag is called myEchoQ. When myEchoQ is set to False, no echo is generated and no unnecessary evaluation of x is made, because If has the HoldRest attribute: myEchoQ = False; Mo…

First off, x_ isn’t “any pattern” (it doesn’t match multiple arguments, for example). So, the evaluator must evaluate the arguments before it can determine a match. The pattern ___ would be closer to “any pattern”, but I don’t know if even that would preempt evaluation of the argument. But I wouldn…

How to turn a function off and on

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henrikschachner (Henrik Schachner) July 5, 2023, 6:50pm 4

This reminds me of that old discussion from three years ago.

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How to turn a function off and on

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