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variable in javascript

 just like we follow some rule while speaking english (grammer rule), we have some rull to follow while  writting javascript programming. the set of these rules is called syntax in javascript


what is a variable ?

A variable is a container that store  a value this is very similar to the container used to store like chini, chiyapatti, kitnashak aushdhi, some electronic gadgate etc (treat this as a analogy)

the value of a javascript can be changed during executing of a program

                var a = 7;
                  let a = 7;
7    =  litral 
a    =  identifier 
=   =  assignment operator 

Rules for choosing varible name 

1.  Letters, digits, underscores & $ is allowed
2.  must begin with a $,_ or a letter
3.  javascript reserved word cannot be used as varible name
4.  RoShay & roshay are different variable (case sensetive)




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