[racket] Cond function with test-expr = then-body works but is it wise?

It is possible to create a cond test-expr that also serves as the
then-body, however, this means that the expression would be executed twice.

This seems to be ill advised in principle.

 Question: If it is ill-advised to create a cond test-expression that also
serves as the then body, then what function is recommend?


 I am aware of the (cdr (or ... form.

I am aware of the cond ... test-expr => proc-expr] form option.

Thanks

Don Green
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