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"Nobody should call themselves a professional if they only know one language". Presumably he means programming language, but this may apply more generally.

• hardware2win 3y ago
  Thats very bad take. Concepts are above languages.
  • wizerdrobe 3y ago
    I would respectively beg to differ. Getting your hands dirty actively engaged in the practice of building software in multiple languages is needed to get good, diverse sets of experience around what works and why. Reading books or worse, opinions on HN, just isn’t sufficient to claim a robust and well-rounded resume.
    • hardware2win 3y ago
      Nowadays languages are huge enough to cover various paradigms and countless concepts That should enough, right?