If the engine is working on a statement like:
if switchA or switchB then doSomething
and switchA evaluates to true, then switchB is not evaluated; this can be important if switchB is an expression that has side effects, or if it contains an expression that wouldn't be valid if switchA is true. For example,
if x1= x2 or (y1-y2)/(x1-x2)=z then doSomething
Similarly, if you have:
if switchA and switchB then doSomething
and switchA evaluates to false, then switchB will not be evaluated.
Hope this is helpful to someone.
Jim Lyons
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