It may be a less useful technique to improve programming skills when you are well versed in different kinds of languages but it could be argued that what you ar

It may be a less useful technique to improve programming skills when you are well versed in different kinds of languages but it could be argued that what you are striving for with your projects in different fields can be achieved when someone who has programmed for 5 years in java and only java goes and learns how to do substantial things in a language like haskell.