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Declaring Variables in Javascript

JavaScript implement loosely types technique for declaring variable i.e. variable can take any form of data String or Number. A variable is responsible for holding the data in the computer memory. To access this data from the memory JavaScript refer to the variable name.





Syntax:

   var variable_name;

Example - Assigning Numeric value to variable

<script type="text/javascript">
   var myVariable = 5;  //Assign number 5 to myVariable
</script>

Example - Assigning String value to variable

<script type="text/javascript">
   var myVariable = "this is a string";  //Assign string "this is a string" to myVariable
</script>

To perform mathematics operations on the variables Arithmetic Operators are used. Arithmetic Operators used are Addition(+), Substraction(-), Multiplication(*), Division(/). Apart from arithmetic operator there are special operator like Modulus(%), Incremental(++) and Decremental Operator(–). The other sets of operator getting used in JavaScript are the Boolean Operator viz AND(&&), OR(||)and NOT(!) operator.

Keywords in Javascript:
These are special words reserved only for the JavaScript engine. These words has special meaning for the JavaScript parser and so these words cannot be used as a variable in JavaScript. If you try to assign this keywords as variables JavaScript will start throwing errors.

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