In the article, I mention that linters for dynamic langs are crippled. Of course I use them when writing Ruby. But can any of these tools tell me: - When two

In the article, I mention that linters for dynamic langs are crippled. Of course I use them when writing Ruby. But can any of these tools tell me: - When two equivalent anonymous functions can be extracted out? - When a library method already exists for an expression? - When you fail to match every possible result in a case statement?