Javscript operators

JavaScript Operators

The instanceof Operator

The instanceof operator is used to check the type of an object at run time. The instanceof operator
returns a boolean value that indicates if an object is an instance of a particular class. we can see below example.

var fruits = ["apple", "mango", "pineapple"];

fruits instanceof Array;          // returns true
fruits instanceof Object;         // returns true
fruits instanceof String;         // returns false
fruits instanceof Number;         // returns false

in operator

The in operator is used to check whether a given property is available on an object.
property in object

var fruits = ["apple", "mango", "pineapple"];

apple in fruit      //returns true
0 in fruit          // returns true
5 in fruit          //returns false
length in fruit     // return true

The delete Operator

The delete operator deletes a property from an object.

var person = {firstName:"John", lastName:"Doe", age:40, eyeColor:"red"};
delete person.age;   // or delete person["age"]; 

The typeof Operator

The typeof operator returns the type of a variable, object, function or expression

typeof "Ron"                       //returns string 
typeof 5                          // returns number
typeof NaN                        // returns number
typeof false                      // returns boolean
typeof [1, 2, 3, 4]               // returns object
typeof {name:'Ron', age:23}       // returns object
typeof new Date()                 // returns object
typeof function () {}             // returns function
typeof fruit                      // returns undefined (if fruit is not declared)
typeof null                       // returns object

Logical Operators

Logical operators are used to determine the logic between variables or values.
&& And operator
|| OR operator
! Not operator
if x = 5 and y = 4, the table below explains the logical operators:

(x < 10 && y > 1)              // return is true 
(x === 5 || y === 5)                             // return  is true
!(x === y)                                       // return is true

JavaScript Bitwise Operators

Bit operators work on 32 bits numbers. Any numeric operand in the operation is converted into a 32 bit number.
The result is converted back to a JavaScript number.
& AND x = 5 & 1 0101 & 0001 0001 1
| OR x = 5 | 1 0101 | 0001 0101 5
~ NOT x = ~ 5 ~0101 1010 10
^ XOR x = 5 ^ 1 0101 ^ 0001 0100 4
<< Left shift x = 5 << 1 0101 << 1 1010 10

Right shift x = 5 >> 1 0101 >> 1 0010

Comparison Operators

Comparison operators are used to determine equality or difference between variables or values.
Given that x = 7, the table below explains the comparison operators:

description
== equal to	=== equal value or equal type
!= not equal	!== not equal value or not equal type
> greater thane	< less than
>= greater than or equal to	<= less than or equal to

     x == 8 // return false 
     x == 7 // return true 
 x === "7" // return false 
 x === 5 // return true 
 x != 7    // return true 
 x !== "7"  // return true 
 x !== 7 // return false 
    x > 8 // return false
 x < 8 // return true 
 x >= 8 // return false 
 x <= 8 // return true

JavaScript String Operators

The + operator, and the += operator can also be used to concatenate (add) strings.

var text1 ="hello",
var text2 ="Ron"'
text3 = text1 + text2    // return  hello Ron
text1  += text2         // return  hello Ron

JavaScript Assignment Operators

Assignment operators are used to assign values to JavaScript variables.
Given that x = 12 and y = 3, the table below explains the assignment operators:
JavaScript Arithmetic Operators
Arithmetic operators are used to perform arithmetic between variables and/or values.
Given that y = 5, the table below explains the arithmetic operators:
Operator Description Example Result in y Result in x Try it

•          Addition x = y + 2 y = 5 x = 7 
  

•          Subtraction x = y - 2 y = 5 x = 3 
  

•          Multiplication x = y * 2 y = 5 x = 10 
  

/ Division x = y / 2 y = 5 x = 2.5
% Modulus (division remainder) x = y % 2 y = 5 x = 1
++ Increment x = ++y y = 6 x = 6 x = y++ y = 6 x = 5
– Decrement x = --y y = 4 x = 4 x = y-- y = 4 x = 5