Map() function with the help of JavScript Array of Objects....

JavaScript Map function Regarding Array of objects...

var student = [
            { fname: "mayuk", lname: "mukherjee", science : 
   {'physics' : '99', 'chemisrty' : '88', 'mathematics' : '97'} },
            { fname: "suryendu", lname: "sarkar",science : 
   {'physics' : '90', 'chemisrty' : '68', 'mathematics' : '68'}},
            { fname: "sanlap", lname: "gadai",science : {'physics' 
   : '83', 'chemisrty' : '98', 'mathematics' : '67'}}
        ]; 

In the above code we have just created a JavaScript array of objects, called student. In that Array of objects each Single element is an object and each object has three properties =>
a) fname , lname, science
b) science is itself a property and a object
c) "science" property will be called nested object
d) "science" object has three properties like -> 'physics', 'chemistry', 'mathematics'.

 var b = student.map(stu_name);
 var c = student.map(science_total);

        for(var i = 0; i < b.length; i++){
            document.write("Total marks for "+b[i]+" is : "+c[i]+"<br>");
        }

        function stu_name(name_data){
             var nm;
             nm = name_data.fname+" "+name_data.lname;
             return nm;
        }

        function science_total(marks){
            var sumation;
            sumation = parseInt(marks.science.physics) + parseInt(marks.science.chemisrty) + parseInt(marks.science.mathematics);
            return sumation;
        }   

a) Now by map() function we will access each single object from this array of objects called "student".
b) We have created two map() function which are callback functions => stu_name(), science_total().

output : 
Total marks for mayuk mukherjee is : 284
Total marks for suryendu sarkar is : 226
Total marks for sanlap gadai is : 248

a) after all the code you write you will get this above output