Functions in JavaScript

    Functions in JavaScript are reusable blocks of code that allow you to perform specific tasks. They help organize and structure the code, making it more modular and easier to understand.

What are functions?

    A function is a set of instructions that performs a specific task. A function can be called as many times as needed, which helps avoid code repetition.

Declaring a function

    In JavaScript, a function is declared as follows:

function miFuncion() {
  console.log("Hello, world!");
}

    In this example, the miFuncion function displays a message in the console.

How are functions used?

    To use a function, you simply call it by its name followed by parentheses. If the function has parameters, the values must be passed within the parentheses.

miFuncion(); // Calls the function and displays the message

Functions with parameters

    Functions can receive parameters to make them more dynamic. A parameter is a value that is passed to the function for use in its execution.

function saludar(nombre) {
  console.log("Hello, " + nombre + "!");
}

saludar("Juan"); // Displays "Hello, Juan!"

Types of functions

    In JavaScript, there are several types of functions:

• Declared functions: These are functions defined using the `function` keyword.
• Anonymous functions: These are functions that do not have a name and are assigned to variables.
• Arrow functions: These are a more compact way of writing functions.

Example of an anonymous function

const saludo = function() {
  console.log("Hello, world!");
};

saludo(); // Calls the anonymous function

Example of an arrow function

const saludo = () => {
  console.log("Hello, world!");
};

saludo(); // Calls the arrow function

Why learn functions in JavaScript?

    Functions are fundamental in JavaScript because they allow you to structure and organize code, reduce repetition, and improve readability. They are also essential for working with events, manipulating the DOM, and developing interactive applications.