Functions are the heart of JavaScript and functions are the beautiful parts of JavaScript.

Well , Functions are the most important part of JavaScript and in this blog I am not going to cover functions in detail instead I will be explaining hell lot of Jargons which will be beneficial for the Interview .

• Function statement : Function statement is nothing but how we write the functions in JavaScript. example :

function fun(){
// some code
}

• Function Expressions : Well its a confusing one when we allocate a function to a variable then it is called as function expression. example : const a = function(){ //code } a();

here function acts like a value

• Function Declaration : Function declaration is nothing but a simple function definition .
  example :
  
function fun(){ // some code }


• Anonymous function : Function without a name is called anonymous function .

example :
`
let fun = function(){ // some code }

fun() ;
`

• Named function expression : These are same as function expression . example :

const a = function () {//some code }

• Function Parameters: Function parameters are the identifiers that function take on its declaration . Take a look at example below .

example :

function app(param1 , param2 )

• Function arguments : Function arguments the identifiers that are supplied, when we call function.

function app(param1 , param2 )
app(arg1, arg2)

• First class functions : First class functions are those functions which can be passed as arguments to another function , function which can return another function and assign a function to a variable . So combination of all the above functions are said to be higher order functions .

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source - youtube and mdn docs