[1Day-1CS] Declarative Programming

Programming Paradigms

A development methodology that serves to give programmers a perspective on programming.

Declarative vs. Imperative

• Declarative: a paradigm that focuses on solving for what (What)

• Imperative: a paradigm that focuses on how to solve (How)

Example) Declarative: the address of your house (specify exactly where it is) Imperative: the route to the house (showing how to get to the location)

Types of Declarative Programming

Functional Programming

• A programming paradigm that implements logic by stacking small pure functions like blocks, and higher-order functions for greater reusability.

• Pure functions: A function whose output depends only on its input.

• Higher-order functions: Functions that take parameters as values to generate logic.

Higher-order functions can be used if the language is First Class Object.

• Characteristics of First Class Objects

• Functions can be assigned to variables or methods

• Can contain functions as parameters inside functions

• Functions can return functions