Functions and arrow functions

In JavaScript, a function is a block of code that can be executed repeatedly with different inputs. Functions can take parameters and return a value. Functions are declared using the "function" keyword, followed by the function name and a list of parameters within parentheses.

The syntax for declaring a function is:

function functionName(param1, param2, ...) { // code to be executed return value; }

An arrow function is a shorthand way of declaring a function in JavaScript. Arrow functions were introduced in ECMAScript 6 and have a more concise syntax compared to traditional functions.

The syntax for declaring an arrow function is:

const functionName = (param1, param2, ...) => {

  // code to be executed

  return value;

}

Functions and arrow functions are important in JavaScript because they allow for code reusability and modularity, making it easier to write and maintain complex applications.