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What is an operator? Explain in detail.

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Operators are the symbols used to perform an operation. 

1. Arithmetic operators: 

It is a binary operator. It is used to perform addition(+), subtraction(-), division (/), multiplication(*), modulus(%-gives the remainder), increment(++) and decrement(—) operations. 

Eg. If x=10 and y=3 then

   x+y    x-y    x*y x/y x%y
13 7 30 3.333 1

lf x=10 then

document.write(++x); → It prints 10+1=11

If x=10 then 

document.write(x++); → It prints 10 itself. 

If x=10 then 

document.write(—x); It prints 10-1=9 

lf x=10 then 

document.write(x—); → It prints 10 itself.

2. Assignment operators:

If a=10 and b=3 then a=b. This statement sets the value of a and b are same, i.e. it sets a to 3.

It is also called short hands If X=10 and Y= 3 then

3. Relational(Comparison) operators:

It is used to perform comparison or relational operation between two values and returns either true or false.

Eg: If X=10 and Y=3 then

X<y X<=Y X>Y X>=Y X==Y X!=Y
false false true true false true

4. Logical operators:

Here AND(&&), OR(||) are binary operators and NOT(!) is a unary operator. It is used to combine relational operations and it gives either true or false

If X=true and Y=false then

X && X X && Y Y && X Y && Y
true true true false

Both operands must be true to get a true value in the case of AND(&&) operation

If X=true and Y=false then

X||X X||Y Y||X Y||Y
true true true false

Either one of the operands must be true to get a true value in the case of OR(||) operation 

If X= true and Y=false then

  IX !Y
false true

5. String addition operator(+): 

This is also called concatenation operator. lt joins(concatenates)two strings and forms a string.

Eg: var x, y, z; 

x= “BVM HSS; 

y= “Kalparamba”; 

z=x+y; 

Here the variable z becomes “BVM HSS Kalparamba”. 

Note: If both the operands are numbers then addition operator(+) produces number as a result otherwise it produces string as a result.

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