Why are dynamic type systems important?

Question

Is there really a necessary use case? If a type is eventually expected to meet the parameter requirements of a procedure, what is the benefit? You could argue that in a language where all types are compatible with all operators this isn't true. But you can't always write code that's compatible with all trivial types.Working with Python, a lot of times I find myself having to figure out the type anyway.Is it just to make higher level languages more friendly to beginners, until they learn enough to realize data types do exist?

cratermoon · Accepted Answer

Simpler syntax, avoiding all the declaration code
Don't need to be compiled
Easier to keep changes small and local to the code changing
Unit tests need less boilerplate/mocking/stubs
Simpler metaprogramming
Easier generic programming

Why are dynamic type systems important?

Simpler syntax, avoiding all the declaration codeDon't need to be compiledEasier to keep changes small and local to the code changingUnit tests need less boilerplate/mocking/stubsSimpler metaprogrammingEasier generic programming

Simpler syntax, avoiding all the declaration code
Don't need to be compiled
Easier to keep changes small and local to the code changing
Unit tests need less boilerplate/mocking/stubs
Simpler metaprogramming
Easier generic programming