Function Declaration is one of the ways to create functions in JavaScript.

Syntax of Function Declaration

function functionName(parameters) {
  // function body
}

• function — keyword used to declare a function.
• functionName — name of the function, used to call it.
• parameters — arguments passed to the function (optional).
• function body — code that is executed when the function is called.

Example

function sayHello() {
  console.log('Hello!');
}

sayHello(); 
// Output: Hello!

Features of Function Declaration

• Functions declared this way are hoisted, meaning they can be called before they are defined in the code.
• It’s the most common and readable way to define a function.

Summary

Function Declarations are a basic building block of JavaScript and are essential for organizing and reusing code.