Is it possible to define multiple variables within the same statement?
=======================================================================
yes

// defining of multiple variables within the same statement

a = 30,b = 20,c = 10;
var p = 11,q = 22,r = 33;
let x = 1,y = 2,z = 3;

console.log(a,b,c);
console.log(p,q,r);
console.log(x,y,z);

==========================================
Do we re-assign the value for variable with var?
================================================
Yes

If the variable is with var:
	1) Re-definition/Re-initialization
	2) Re-assignment

var a = 123;    // initialization

console.log(a);

a = 112; // initialization// re-assignment
console.log(a);

var a = 100; // re-definition/Re-initialization

console.log(a);

=======================================
Is it possible to re-define let and const variables?
=====================================================
no.

let:
====
	1) initialization
	2) re-assignment
	3) re-definition ==> not possible

let a = 121;

console.log(a);

a = 222;

console.log(a);

// let a = 333;


const:
======
	1) re-assignment and 
	2) re-definition ==> not possible

const a = 123;

console.log(a);

// a = 234;
// const a = 1122;
// console.log(a);

========================================
Conditional Operator:
=====================
?:
==> ternary operator
Syntax:
	resultant = (test_expression/test_condition) ? expression_1 : expression_2;

// WAP IN JAVASCRIPT TO CHECK WHETHER THE NUMBER IS POSITIVE OR NEGATIVE.

/*
n > 0 ==> Positive
n < 0 ==> Negative
*/

var n = 112;

result = (n > 0) ? "It is positive number" : "It is negative number";

console.log(result);
================================================

// WAP IN JS TO CHECK WHETHER THE GIVEN NUMBER IS EVEN OR ODD USING CONDITIONAL OPERATOR.

/*
n dividing with 2 by return '0' as remainder ==> even
n dividing with 2 by returning '1' as remainder ==> odd
*/

n = 135;

let result = (n % 2 == 0) ? "It is an Even number." : "It is an Odd number.";

console.log(result);

============================================
Assignment:
==========
1) WAP IN JS TO FIND THE BIGGEST NUMBER AMONG TWO NUMBERS USING CONDITIONAL OPERATOR.

=====================================
typeof()
========
==> used to get the type of value.
Syntax:
	typeof(variable)

var a = 121;
var b = 1.21;
var c = 'string';
var d = 'c';

console.log(typeof(a));
console.log(typeof(b));
console.log(typeof(c));
console.log(typeof(d));