09.05.2017
Tuesday.

Arithmatic operaters 

Operator            Description
  +                       Addition

  -                        Subtraction

  *                        Multiplication

  /                          Division

  %                        Modulus

  ++                       Increment

  --                         Decrement

JavaScript String Operators

 

 The + operator can also be used to add (concatenate) strings.


<p id="demo"></p>

<script>
var txt1 = "John";
var txt2 = "Doe";
document.getElementById("demo").innerHTML = txt1 + " " + txt2;
</script>
 John Doe
 The += assignment operator can also be used to add (concatenate) strings:

<script>
txt1 = "What a very ";
txt1 += "nice day";
document.getElementById("demo").innerHTML = txt1;
</script>
What a very nice day

JavaScript Comparison Operators

Operator	Description
==	equal to
===	equal value and equal type
!=	not equal
!==	not equal value or not equal type
>	greater than
<	less than
>=	greater than or equal to
<=	less than or equal to
?	ternary operator

Data types

 

Primitive Data

A primitive data value is a single simple data value with no additional properties and methods.
The typeof operator can return one of these primitive types:

• string
• number
• boolean
• null
• undefined

Complex Data

The typeof operator can return one of two complex types:

• function
• object