Day 3 : What is an Operators and Operands in Javascript ?

The numbers (in an arithmetic operation) are called operands.

The operation (to be performed between the two operands) is defined by an operator.

Operators:-

There are different types of JavaScript operators:

● Arithmetic Operators

● Assignment Operators

● Comparison Operators

● Logical Operators

● Conditional Operators

● Type Operators

Arithmetic Operators:-

A typical arithmetic operation operates on two numbers.

Operator	Description
+	Addition
-	Subtraction
	Multiplication
/	Division
%	Modulus (Division Remainder)
*	Exponentiation (ES2016)

++ Increment

-- Decrement

Example:-

let x = 10, y = 20;

console.log(x + y); // 30

console.log(x - y); // -10

console.log(x * y); // 200

console.log(y / x); // 2

console.log(y % x); // 0

console.log(5 ** 2); // 25

console.log(a++); // 10

console.log(++a); // 11

console.log(a–-); // 10

console.log(--a); // 9

Assignment Operators:-

Assignment operators assign values to JavaScript variables.

Operator	Example	Same As
=	x = y	x = y
+=	x += y	x = x + y
-=	x -= y	x = x - y
=	x = y	x = x y
/=	x /= y	x = x / y
%=	x %= y	x = x % y
=	x = y	x = x * y

Example:-

let x = 10, y = 20;

let z = x; // z = 10

console.log(x += y); // 30

console.log(x -= y); // -10

console.log(x *= y); // 200

console.log(y /= x); // 2

console.log(y %= x); // 0

console.log(y **= x); // 25

Comparison Operators:-

Operator	Description
==	Equal to
===	Equal value and equal type
!=	Not equal
!==	Not equal value and not equal type
>	Greater than
>=	Greater than or equal to
<	Less than
<=	Less than or equal to
? :	Ternary Operator

Example:-

console.log(10 == 10); // true

console.log(10 === 10); // true

console.log(“0” == false); // true

console.log(false == “0”); // true

console.log(false === “0”); // false

console.log(10 != 20); // true

console.log(0 ! = false); // true

console.log(10 > 20); // false

console.log(10 >= 20); // false

console.log(10 < 20); // true

console.log(10 < = 20); // true

Type Operators:-

Operator

Description

typeof Returns the type of a variable

instanceof Returns true if an object is an instance of an object type

Logical Operators:-

Operator	Description
&&	Logical And
||	Logical OR
!	Logical Not
^	Logical XOR

Example:-

let a = 2, b = 3, c;

c = –-a && b++; // if first condition value is 1 after it is continue console.log(a,b,c); // 1, 4, 3

c = –-a || b++; // 1, 3, 1

console.log(a ! = b); // true

console.log(1 ^ 1); // 0

console.log(0 ^ 1); // 1

console.log(1 ^ 0); // 1

console.log(0 ^ 0); // 0

console.log(1^0^1); // 0

console.log(0^1^0); // 1

console.log(1^1^1); // 1

console.log(0^0^0); // 0

Operator Precedence:-

Multiplication (*) and division (/) have higher precedence than addition (+) and subtraction (-).

And (as in school mathematics) the precedence can be changed by using parentheses.

When using parentheses, the operations inside the parentheses are computed first.

Null(Object):-

The null value represents the intent absence of any object value. It is one of javascript’s primitive values and is treated as falsy for boolean operations.

Undefined:-

A variable that has not been assigned a value is of type undefined . Example:-

let a;

console.log(a); // value is undefined, type is undefined

Empty Values:-

An empty value has nothing to do with undefined. An empty string has a legal value and a type.

NaN:- (Not a number)

NaN type of number. Nan is a number that is not a legal number. Example:-

let a;

a = 10*“s” ;

console.log(a); // value is NaN, type is Number

console.log(null == NaN); // false

console.log(null === NaN); // false

console.log(null == undefined); // true

console.log(null === undefined); // false

console.log(undefined == NaN); // false

console.log(undefined === NaN); // false

console.log(true == undefined); // false console.log(false == undefined); // false

console.log(true == NaN); // false console.log(false == NaN); // false

console.log(true == null); // false console.log(false == null); // false