Function in JavaScript

Function

A function in JavaScript is a reusable block of code designed to perform a specific task. It can take inputs (parameters) and return an output.

Function Declaration

a function should be declared by their name and the function name should be called at end to specify tasks.

Types of Function

Named Function

function drive()
{
   console.log("car");
}
drive();

o/p - car

Function Expression

let drive = function() {
   return 'car';
}
console.log(drive());

o/p - car

Anonymous function

const drive = function() {
  return "Drive slowly";
};
console.log(drive());

o/p - Drive slowly

Arrow function

let add = (num) => num + 2;
console.log(add(5));

o/p - 7