Functors and Monads
Functors are containers that have value and if you apply a function to that value you get the same kind of container with the value inside of it transformed.
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Expressions vs Statements
One fundamental difference between imperative and functional style is that the first one relies heavily on statements to accomplish everything, while functional code relies on expressions.
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Pure functions
Pure function is function with no side effects and its result is determined only by the input arguments.
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Honest functions
The signature of an honest function must convey all information about the possible input values and the possible outcome it may produce.
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