The Art of Programming

Post Date : 2022-10-29T18:16:57+07:00

Modified Date : 2022-10-29T18:16:57+07:00

Category: cheatsheet

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Topics to be discussed are anything about concepts in programming

1. Imperative programming vs Declarative programming
2. Aspect Oriented Programming

Imperative programming vs Declarative programming

Functional Programming is a declarative programming paradigm, in contrast to imperative programming paradigms.

Declarative programming is a paradigm describing WHAT the program does, without explicitly specifying its control flow.

Imperative programming is a paradigm describing HOW the program should do something by explicitly specifying each instruction (or statement) step by step, which mutate the program’s state.

Making a chocolate cake

The imperative way

• First, turn on the oven to preheat it at 180°C.
• Next, add flour, sugar, cocoa powder, baking soda and salt to a large bowl, then stir the mixture with a paddle.
• Then, add milk, vegetable oil, eggs and vanilla extract to the mixture, and mix together on medium speed until well combined.
• Distribute the cake batter evenly in a large cake pan, then bake it for approx. 30 minutes.
• Remove the pan from the oven with a pot holder, let it cool for 10 minutes.
• Finally, remove the cake from the pan with the tapping method, and frost it evenly with chocolate frosting.

The declarative way

• You have to preheat the oven to 180 °C.
• You have to mix dry ingredients in a bowl.
• Once dry ingredients are mixed, you have to add wet ingredients to the mixture, and mix together to form the cake batter.
• Once the oven and batter are ready, you have to put the batter in a pan, then bake it for 30 minutes.
• Once baked, you have to remove the pan from the oven and let it cool for 10 minutes.
• Finally, you have to remove the cake from the pan, and frost it.

Ready? Go!

Aspect Oriented Programming

• Aims to increase modularity by allowing the separation of cross-cutting concerns.
• It does so by adding behavior to existing code (an advice) without modifying the code itself, instead separately specifying which code is modified via a “pointcut” specification, such as “log all function calls when the function’s name begins with ‘set’”.

Interceptors have a set of useful capabilities which are inspired by the Aspect Oriented Programming (AOP) technique. They make it possible to:

• bind extra logic before / after method execution
• transform the result returned from a function
• transform the exception thrown from a function
• extend the basic function behavior
• completely override a function depending on specific conditions (e.g., for caching purposes)