inheritance

function Person (name, age, isMale) {
    this.name = name;
    this.age = age;
    this.isMale = isMale;
}

Person.prototype.showPersonInfo = function () {
    console.log(this.name + ' is a ' + this.age + ' years old ' + (this.isMale === 'true' ? 'man' : 'woman') + '.');
};

function Student (name, age, isMale, score) {
    Person.call(this, name, age, isMale);
    this.score = score;
}

Student.prototype = Object.create(Person.prototype);
Student.prototype.constructor = Student;
Student.prototype.super = Person;

Student.prototype.showStudentInfo = function () {
    this.showPersonInfo();
    console.log(this.name + ' has ' + this.score + ' scores.');
};

function Employee (name, age, isMale, daySalary) {
    Person.call(this, name, age, isMale);
    this.daySalary = daySalary;
}

Employee.prototype = Object.create(Person.prototype);
Employee.prototype.constructor = Employee;
Employee.prototype.super = Person;

Employee.prototype.showEmployeeInfo = function () {
    this.showPersonInfo();
    console.log(this.name + ' earns ' + this.daySalary + ' lv per day.');
};

Employee.prototype.calculateOvertime = function (hours) {
    if (this.age < 18) {
        return 0;
    }
    var moneyPerHours = this.daySalary / 8;

    return (hours * moneyPerHours * 1.5).toFixed(2);
};

var arrPerson = [],
    id = 1;
for (var i = 0; i < 10; i++) {
    arrPerson.push(new Person('Person' + id++, 15 + Math.round(Math.random() * 30), ['true', 'false'][Math.round(Math.random())]));
}

for (var i = 0; i < 2; i++) {
    arrPerson.push(new Person('Person' + id++,
                                15 + Math.round(Math.random() * 30),
                                ['true', 'false'][Math.round(Math.random())]));
    arrPerson.push(new Student('Person' + id++,
                                15 + Math.round(Math.random() * 30),
                                ['true', 'false'][Math.round(Math.random())],
                                Math.round(Math.random() * 10)));
    arrPerson.push(new Employee('Person' + id++,
                                15 + Math.round(Math.random() * 30),
                                ['true', 'false'][Math.round(Math.random())],
                                10 + Math.round(Math.random() * 20)));
}


arrPerson.forEach(function(person) {
    //console.log(person);
    if (person instanceof Student) {
        person.showStudentInfo();
    } else if (person instanceof Employee) {
        person.showEmployeeInfo();
    } else {
        person.showPersonInfo();
    }
});

console.log('-------------------------');
for (var i = 0; i < arrPerson.length; i++) {
    //console.log(arrPerson[i])
    if (arrPerson[i] instanceof Employee) {
        console.log('For 2 hours overtime, ' + arrPerson[i].name + ' earns ' + arrPerson[i].calculateOvertime(2));
    }
}


//зад.5
Person.prototype.showInfo = function () {
    console.log(this.name + ' is a ' + this.age + ' years old ' + (this.isMale === 'true' ? 'man' : 'woman') + '.');
};

Student.prototype = Object.create(Person.prototype);
Student.prototype.constructor = Student;
Student.prototype.super = Person;

Student.prototype.showInfo = function () {
    Person.prototype.showInfo.call(this);
    console.log(this.name + ' has ' + this.score + ' scores.');
};

Employee.prototype = Object.create(Person.prototype);
Employee.prototype.constructor = Employee;
Employee.prototype.super = Person;

Employee.prototype.showInfo = function () {
    Person.prototype.showInfo.call(this);
    console.log(this.name + ' earns ' + this.daySalary + ' lv per day.');
};

arrPerson.forEach(function(person) {
    person.showInfo();
}