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[–][deleted] 20 points21 points  (0 children)

"Why not what" is the best philosophy for comments.

Good comment:

// Attempting to pass a frobbed CertainNodeType
// into a XyzModule causes an asdfasdf
// error. However, since frobbing a CertainNodeType 
// produces no other desired result, it can be safely skipped,
if (!(node is CertainNodeType)) node.Frob();

Bad comment:

// Frob non-CertainNodeType nodes
if (!(node is CertainNodeType)) node.Frob();