Function

In programming, a function is a self-contained block of code that performs a specific task or set of tasks. Functions are designed to be reusable, meaning that they can be called multiple times from different parts of a program without having to rewrite the code each time.

A function typically takes input parameters and returns output based on the input. The input parameters are used as arguments when the function is called, and the returned output is used by the calling code.

Functions are used to help organize code into smaller, more manageable pieces, making it easier to read, write, and debug. They also allow developers to reuse code, which can save time and reduce errors.

Functions can be defined in various programming languages, such as JavaScript, Python, and C++. Here is an example of a simple JavaScript function:

function addNumbers(num1, num2) {
  return num1 + num2;
}

This function takes two input parameters (num1 and num2) and returns their sum. The function can be called from another part of the program like this:

let result = addNumbers(5, 3);
console.log(result); // Output: 8

In this example, the addNumbers function is called with the arguments 5 and 3, and the returned result (8) is stored in the variable "result".