1. Use Yoneda Lemma. Its intuitive explanation is:
You work at a particle accelerator. You want to understand some particle. All
you can do are throw other particles at it and see what happens. If you
understand how your mystery particle responds to all possible test particles at
all possible test energies, then you know everything there is to know about your
mystery particle.

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2. Use Howard Curry isomorphism. It states something like:
A program is a proof that from a given business problem a certain solution
(proposed by a business domain expert) can really be derived. I.e. it's not the
programmer solving problems. All the solutions exist per se already. The
programmer just connects a problem with a particular solution by writing some
code.
So:
- For every method using global variables create its functional version with
object types, e.g.:
old: int foo(int x) { return x + this.y;}
new: Integer fooFunctional(Integer x, Integer y) { return x + y;}
- For every function create its fully typed version:
old: Integer fooFunctional(Integer x, Integer y) { return x + y;}
new: FooType fooFunctionalTyped(XType x, YType y) { return x + y;}
where XType and YType may be e.g. only odd or even Integers and FooType is
an union of XType and YType.
- simplify your type system
- profit! :)
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