//first way

var john = {

name: 'John',

lastName: 'Smith',

yearOfBirth: 1990,

job: 'teacher',

isMarried: false,

family: ['Jane', 'Mark', 'Bob'],

calculateAge: function() {

return 2016 - this.yearOfBirth;

}

};

//console.log(john.calculateAge(1970));

console.log(john.calculateAge()); // calculate john age , output 26

var age = john.calculateAge();

john.age = age;

console.log(john);

//---------------------------

//second way

var john = {

name: 'John',

lastName: 'Smith',

yearOfBirth: 1990,

job: 'teacher',

isMarried: false,

family: ['Jane', 'Mark', 'Bob'],

calculateAge: function() {

this.age = 2016 - this.yearOfBirth;

}

};

john.calculateAge();

console.log(john);

//mike calcuate birth

var mike = {

yearOfBirth: 1950,

calculateAge: function() {

this.age = 2016 - this.yearOfBirth;

}

};

mike.calculateAge();

console.log(mike);