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Don't ruin the complexity of your interface with checking.

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Titus Winters 2015-11-17 16:22:21 -05:00
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@ -749,7 +749,7 @@ The date is validated twice (by the `Date` constructor) and passed as a characte
##### Example
Excess checking can be costly.
There are cases where checking early is dumb because you may not ever need the value, or may only need part of the value that is more easily checked than the whole.
There are cases where checking early is dumb because you may not ever need the value, or may only need part of the value that is more easily checked than the whole. Similarly, don't add validity checks that change the asymptotic behavior of your interface (e.g., don't add a `O(1)` check to an interface with an average complexity of `O(1)`).
class Jet { // Physics says: e*e < x*x + y*y + z*z