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Declarative programming

TLDR: Declarative programming is a way of writing computer programs that focuses on describing what the program should accomplish, rather than how it should be done. It is a programming paradigm that simplifies the logic of a computation by modeling it in a more natural and intuitive way.

Declarative programming is a style of programming that aims to express the logic of a computation without explicitly specifying the control flow. Instead of describing the steps that need to be taken to solve a problem, declarative programming focuses on modeling the problem itself and letting the computer figure out the best way to solve it.

In declarative programming, the emphasis is on describing what the program should accomplish, rather than how it should be done. This is in contrast to imperative programming, which involves explicitly specifying the sequence of steps to be executed.

Declarative programming languages often minimize or eliminate side effects, which are changes to the program's state that can make it harder to reason about and debug. Instead, they focus on describing the problem domain and the relationships between different elements of the program.

Common examples of declarative programming languages include SQL for database queries, regular expressions for pattern matching, and functional programming languages like Haskell and Prolog.

Declarative programming can greatly simplify the process of writing parallel programs, as the focus is on describing the problem and letting the computer handle the details of parallel execution.

Overall, declarative programming is a powerful approach to writing computer programs that allows developers to focus on the problem at hand rather than the implementation details. It can lead to more concise, readable, and maintainable code.

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