Professional developer for twenty years. Team lead, technical lead.
What I love is to code stuff. I appreciate pair programming. I think software design is important. I also love to debug code.
If you have a deep understanding of a lower level language (like C) and a higher level one (like Java) plus maybe a functional language, then adding more languages should not make you a Jack of all trades.
Instead you get the pattern of a new language faster and you should have a gut feeling of what is going on when you use certain features of those languages.
I started (in that order) with C, Assembler, C++, Delphi, Java (functional language still missing). Knowing how to connect C functions with Assembler routines is not a thing I need for my day to day work, but it helped to understand the concept of by-reference and by-value parameters, stacks, scopes etc.
Knowing how to allocate and dispose memory by hand (and how to avoid leaks using certain patterns) helps me also in languages with a garbage collector to avoid leaking resources and to avoid wasting CPU time by producing a lot of short-term objects for instance.
Conclusion: The point is to have a deep understanding of maybe two languages. Otherwise you would be a master of none, and not even a Jack of all trades.
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If you have a deep understanding of a lower level language (like C) and a higher level one (like Java) plus maybe a functional language, then adding more languages should not make you a Jack of all trades.
Instead you get the pattern of a new language faster and you should have a gut feeling of what is going on when you use certain features of those languages.
I started (in that order) with C, Assembler, C++, Delphi, Java (functional language still missing). Knowing how to connect C functions with Assembler routines is not a thing I need for my day to day work, but it helped to understand the concept of by-reference and by-value parameters, stacks, scopes etc.
Knowing how to allocate and dispose memory by hand (and how to avoid leaks using certain patterns) helps me also in languages with a garbage collector to avoid leaking resources and to avoid wasting CPU time by producing a lot of short-term objects for instance.
Conclusion: The point is to have a deep understanding of maybe two languages. Otherwise you would be a master of none, and not even a Jack of all trades.