Tuesday, October 21, 2014

Operators In Javascript

  • JAVASCRIPT OPERATOR:

ARITHMATIC OPERATOR
ASSIGNMENT OPERATOR
COMPARISION OPERTOR
LOGICAL OPERATOR
CONDITIONAL OPERATOR

ARITHMATIC OPERATOR:

  • 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

+

Addition

x=y+2

x=7

-

Subtraction

x=y-2

x=3

*

Multiplication

x=y*2

x=10

/

Division

x=y/2

x=2.5

%

Modulus (division remainder)

x=y%2

x=1

++

Increment

x=++y

x=6

--

Decrement

x=--y

x=4

 

 

 

 

ASSIGNMENT OPERATOR:

  • Assignment operators are used to assign values to JavaScript variables.
  • Given that x=10 and y=5, the table below explains the assignment operators:

Operator

Example

Same As

Result

=

x=y

 

x=5

+=

x+=y

x=x+y

x=15

-=

x-=y

x=x-y

x=5

*=

x*=y

x=x*y

x=50

/=

x/=y

x=x/y

x=2

%=

x%=y

x=x%y

x=0

 

 

 

 

 

COMPARISION OPERATOR:

  • Comparison operators are used in logical statements to determine equality or difference between variables or values.
  • Given that x=5, the table below explains the comparison operators:

Operator

Description

Example

==

is equal to

x==8 is false

===

is exactly equal to (value and  type)

x===5 is true
x==="5" is false

!=

is not equal

x!=8 is true

is greater than

x>8 is false

is less than

x<8 is true

>=

is greater than or equal to

x>=8 is false

<=

is less than or equal to

x<=8 is true

How Can it be Used

  • Comparison operators can be used in conditional statements to compare values and take action depending on the result:

 For Example:

    If (age<18) 
               document.write("Too young");
 LOGICAL OPERATOR:
  • Logical operators are used to determine the logic between variables or values.
  • Given that x=6 and y=3, the table below explains the logical operators:

Operator

Description

Example

&&

        and

(x < 10 && y > 1) is true

||

          or

 (x==5 || y==5) is false

!

          not

!(x==y) is true

 

 

 

 CONDITIONAL OPERATORS:

  • JavaScript also contains a conditional operator that assigns a value to a variable based on some condition.

Syntax:
<Variable name> = <condition>? value1: value2

    Example:
x = (y == 5)? “x is true”:”x is false”
- Here if value of y is 5 then value of x = “x is true”
- If value of y is not 5 then value of = “x is false”


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