conditional expression sought

Mark McEahern mark at mceahern.com
Thu Jan 29 19:51:07 CET 2004


Elaine Jackson wrote:

>If bool(B_i)==True for 1<=i<=n and j is the smallest i with bool(A_j)==True,
>then the evaluation of (A_1 and B_1) or ... or (A_n and B_n) returns B_j without
>evaluating any other B_i. This is such a useful mode of expression that I would
>like to be able to use something similar even when there is an i with
>bool(B_i)==False. The only thing I can think of by myself is ( (A_1 and [B_1])
>or ... or (A_n and [B_n]) )[0], and I can't be satisfied with that for obvious
>reasons. Does anybody know a good way to express this? Any help will be mucho
>appreciado.
>
Why not write a unit test that demonstrates the behavior you want?  
It'll then likely be obvious to someone both what your problem is and 
what a likely solution is.

Cheers,

// m




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