Functions in JavaScript

What is Functions?

• Fundamental building blocks of all programming.

• Reusable block of code designed to perform a particular task.

• Functions are executed when they are called.

Example

function greet(){
   return "Hello";
}
console.log(greet());

Function Expression

• A function stored inside a variable.

• Function may or may not have a name.If the function doesn't have a name,then it is called anonymous function.

• If the function is anonymous, the variable name acts as its function name.

Example

const display = function(num){
   console.log(num);
}

Arrow Function

• Arrow Functions allow a shorter syntax for function expressions.

const add = (a,b)=>{
  return a+b;
}
console.log(add(2,3));