Functions:
==========
Another Definition of Function:
===============================
Syntax:
	let/var identifier = function(parameters with comma separation)
	{
		function body statements;
	}

// A PROGRAM TO FIND THE AREA OF THE RECTANGLE.

let area_square = function(a,b)
{
    return a * b;
}

console.log("The Area of the Rectangle = "+area_square(9,7));

============================================
Positional Arguments:
=====================
fun1(x,y,z)
{
	implementation;
}
fun1(a,b,c) # x = a, y = b & z = c
fun1(c,a,b) # x = c, y = a & z = b

// WAP IN JS TO FIND THE AREA OF THE TRIANGLE.

/*
a = sqrt(sX(s-a)X(s-b)X(s-c))
s = a+b+c/2
*/

var area_triangle = function(a,b,c) // a = 5, b = 6 and c = 7
{
    let s = (a + b + c)/2;

    var area = Math.sqrt(s*(s-a)*(s-b)*(s-c));

    console.log("Area = "+area);
}


area_triangle(5,6,7);
area_triangle(3,4,5);
======================================
Keyword Arguments:
==================
function(p,q,r)
{
	implementation;
}

function(p = x,q = y,r = z);
function(p = z,r = x,q = x)

// WAP FOR ACCEPTING THE NAME AND PRINT THE WISH WITH THE NAME.

var greetings = function(name)
{
    message = "Hi," + "Good Evening " + name;
    return message;
}

console.log(greetings(name = "Aakash"));
====================================================

// // WAP FOR ACCEPTING THE NAME AND PRINT THE WISH WITH THE NAME.

// var greetings = function(name)
// {
//     message = "Hi," + "Good Evening " + name;
//     return message;
// }

// console.log(greetings(name = "Aakash"));

var SumNumbers = function(a,b,c,d)
{
    s = a+b+c+d;
    avg = s/4;

    return avg;

    // console.log("Sum = "+s);
}

a = SumNumbers(d = 100,a = 123,b = 112,c = 121);

console.log(a);
==========================================
// // WAP FOR ACCEPTING THE NAME AND PRINT THE WISH WITH THE NAME.

// var greetings = function(name)
// {
//     message = "Hi," + "Good Evening " + name;
//     return message;
// }

// console.log(greetings(name = "Aakash"));

var SumNumbers = function(a,b,c,d)
{
    s = a+b+c+d;
    avg = s/4;

    console.log("Sum = "+s)

    return avg;

    // console.log("Sum = "+s);
}

a = SumNumbers(d = 100,a = 123,b = 112,c = 121);

p = 100;
q = 200;
r = 300;
s = 400;

console.log("Sum = "+SumNumbers(d = p,a = r,q,s)); // a = r, b = q, c = s, d = p

console.log(a);
=============================================

Default Arguments:
==================
function(a = 0,b = 0,c = 0,d = 0)
{
	implementation;
}

function()
function(1,2)

function sumNumbers(a = 0,b = 1,c = 2,d = -1)
{
    sum = a + b + c + d;
    console.log(sum);
        
}

sumNumbers();
sumNumbers(10);
sumNumbers(12,24,36);
=====================================

arguments Keyword:
==================

a[] = {1,2,3,4}
1 ==> index-0
2 ==> index-1
3 ==> index-2

fun()
{
	arguments;
	implementation;
}

fun(1,2,3,,4,);

// arguments Keyword

let Value = function(){
    let s = 0;
    console.log(arguments);
    for(i = 0;i <arguments.length;++i)
    {
        console.log("Index: " + i +  " :" + arguments[i]);
    }
}

Value(1,2,3,4,5,6);
===============================
let ecartBill = function()
{
    let amount = 0;
    for(i = 0;i < arguments.length;++i)
    {
        amount += arguments[i];
    }
    return amount;
}

console.log("My Bill = "+ecartBill());
console.log("My Bill = "+ecartBill(999,1199));
console.log("My Bill = "+ecartBill(999,1199,2999,93,121));

=====================================================
Variable Scope:
================
1) Local Variables ==> Function variables
===================
==> we can access the local variables within the same function.

let abc = function()
{
    let a = 10;
    let b = 20;
    let c= 30;

    console.log(a);
    console.log(b);
    console.log(c);
}

let pqr = function()
{
    console.log(a);
    console.log(b);
    console.log(c);
}

abc();
pqr();

2) Global Variables
====================
==> the variable can define in outside the function and can allow to access in any function within the same program.

var a = 10;
let b = 20;
const c = 123;

function f1()
{
    console.log("a = "+a+" b = "+ b+"c = "+ c);
}

function f2()
{
    console.log("a = "+a+" b = "+ b+"c = "+ c);   
}

f1();
f2();

3) Block Variables
==================
==> the variables can allowed to access within the same block in which we have defined.
==> let and const ==> have block scope
==> var does not have block scope.