/*
javascript methods

types:

1 method with return and with parameter
2 method without return and wothout parameter
3 method with return and wothout parameter
4 method without return and with parameter
*/

// type 1
function add(a,b) {
    return a+b;
}

// calling the function by holding
h = add(1,2);
console.log(h);

// calling the function direct to print in console
console.log(add(1,2));

// type 2
function pi(){
    console.log(3.14);
}

// calling function
pi();

console.log("--------scope--------");
// scope of variable

var a = 10;

function safe(){
    var a = 20;
    var b = 10;
    c = 30;
    console.log(a);
    console.log(b);
    console.log(c);
}
safe();
console.log(a);
// console.log(b) // this is not accessable outside of the function
console.log(c);

console.log("--------block statement--------");
{
    var a = 13;

}
console.log(a);

{
    let e = 12;
    console.log(e);
}

// console.log(e) // this is not accessable outside the block
console.log("--------constant--------");
const pit = 3.14;
var ti = 21;
console.log(ti,pit);

var ti = 22;
// var pit = 22/7;
console.log(ti,pit)

{
    let gb = 12;
    console.log(gb);
}
{
    var gb = 13;
    console.log(gb);
    // var pit = 22/7;
}
console.log("--------class and object--------");

/*
SYNTAX :
    class classname{
        functionname(para){
            return;
        }
    }

    object  =  new classname();
*/

class sample{
    name = "jack" // it is a class variable not a global variable
    print() {
        return this.name
    }
}

s = new sample();
var a = s.print();
console.log(a);
console.log(s.name)

console.log("--------polymorphism and overloading--------");
class animal{
    dog(breed){
        console.log("i am one",breed);
    }
    dog(breed,paw){
        console.log("i am two",breed,paw);
    }
}
a = new animal();
console.log(a.dog("dober"));
console.log(a.dog("dober",2));

class animal_one{
    dog(breed){
        console.log("i am one",breed);
    }
}
class animal_two{
    dog(breed,paw){
        console.log("i am two",breed,paw);
    }
}

b = new animal_one();
console.log(b.dog("dober"));

c = new animal_two();
console.log(c.dog("dober",2));

console.log("--------constructor--------");

class one{
    constructor(a,b,c){
        this.a = a;
        this.b = b;
        this.c = c;
    }
    basic(){
        console.log(this.a,this.b,this.c);
    }
}

d = new one(1,2,3);
d.basic();


class two{
    constructor(){
        this.a = 1;
        this.b = 2;
        this.c = 3;
    }
    basic_2(){
        console.log(this.a,this.b,this.c);
    }
}

e = new two();
e.basic_2();

console.log("--------inheritance and overrideing--------");

class anml{
    dog(){
        console.log("wof");
    }
    cat(){
        console.log("mew");
    }
}
class pet extends anml{
    dog(){
        console.log("bow");
    }
}

o = new anml();
o.dog();
o.cat();

p = new pet();
p.dog(); // over rided
p.cat();