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Several cases when it makes sense. One is mentioned in the article, copied from a math formula. Another frequent case, in clojure and C#, for example, is a plac

by cema 14y ago

Several cases when it makes sense. One is mentioned in the article, copied from a math formula. Another frequent case, in clojure and C#, for example, is a placeholder. Expr.SortBy(x => x.Id) Still, I prefer to comment non-obvious cases.