Alan Perlis famously said, &quot;A language that doesn&#x27;t affect the way you think about programming, is not worth knowing.&quot;<p>A lot of times you can learn something in a new language, and then bring it back to other languages. For a simple example, programming in Python might give a programmer the insight that she doesn&#x27;t need to write a factory for every class; or writing in Haskall might give him the idea that immutability is a good idea.<p>Then when the programmer returns to her original language, she can use those techniques, adapted to the original language.