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Imperative
vs Functional
Imperative vs Functional
vs Reactive
Imperative vs reactive programming
In an imperative programming setting, the expression a:=b+c would mean that a is being assigned the result of b+c in the instant the expression is evaluated, and later, the values of b and c can be changed with no effect on the value of a.
On the other hand, in reactive programming, the value of a is automatically updated whenever the values of b or c change, without the program having to re-execute the statement a:=b+c to determine the presently assigned value of a.