Javascript functions

Functions:

Return is optional , if function needs to return a data use return , else don’t.

return statement could be written as return a or return(a), both are correct syntax. Recommended is ‘return a’

Syntax:   

function function_name(parameters){
 some_code;
 return something;
}

Example:

function sayHello(a,b,c) {
      document.write ("Hello there!"+ "br />");
      return a+b
  }
 a = sayHello(11,2,"e")
 document.write (a);