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script.js
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script.js
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/*start of inheritance*/
function Person(name, age){
this.name = name;
this.age = age;
}
Person.prototype.play=function(){
console.log(`${this.name} is playing`);
}
function Cricketer(type,name,age){
Person.call(this,name,age);
this.type = type;
}
//Cricketer.prototype =Object.create(Object.prototype);
Cricketer.prototype = Object.create(Person.prototype);
/*class Person{
constructor(name,age){
this.name =name;
this.age = age;
}
static play(){
console.log(`${this.name} is playing`);
}
}*/
let sakib = new Cricketer('allRouder','sakib',35);
console.dir(sakib);
//recursion function in javascript
// f(n-1)+ n = f(n)
function sum(n){
if(n=== 0){
return 0;
}else{
return sum(n-1)+n;
}
}
console.log(sum(3));
function mamun(){
}
console.log(mamun());
for(let key in mamun){
console.log(key);
}
let Man={
hand:2,
eys :2,
walk:function(){
console.log('he is walking ');
}
}
console.dir(Object.getPrototypeOf([]));
console.dir(sakib);
function Shap(color){
this.color = color;
}
Shap.prototype.duplicate = function(){
console.log('duplicate from Shap');
}
function extend(Child,Parent){
Child.prototype = Object.create(Parent.prototype);
Child.prototype.constructor = Child;
}
function Circle(radius,color){
Shap.call(this,color)
this.radius = radius;
}
//Circle.prototype = Object.create(Object.prototype);
extend(Circle,Shap);
Circle.prototype.draw = function(){
console.log('draw');
}
Circle.prototype.duplicate = function(){
//Shap.prototype.duplicate.call(this);
console.log('duplicate from circle');
}
function Square(size){
this.size = size;
}
extend(Square,Shap);
Square.prototype.duplicate = function(){
console.log('duplicate from Square');
}
let c = new Circle(1,'red');
let s = new Shap();
let sq = new Square(10);
const shapes =[
new Circle(1,'green'),
new Square(20)
];
for(let shap of shapes)
shap.duplicate();
/*end of inheritance in javascript*/
/*start mixin */
function mixin(target,...sources){
Object.assign(target,...sources);
}
const canEat={
eat: function(){
this.hunger--;
console.log('eating');
}
};
const canWalk ={
walk: function(){
console.log('walking');
}
};
const canSwim={
swim: function(){
console.log('swimming');
}
}
//const person = Object.assign({},canEat,canWalk);
//console.log(person);
function Person(){
}
mixin(Person.prototype,canEat,canWalk);
const person = new Person();
function GoldFish(){};
mixin(GoldFish.prototype,canEat,canSwim);
const goldfish = new GoldFish();
/*My Excercise solution*/
function HtmlElement(){
this.click = function(){
console.log('clicked');
}
}
HtmlElement.prototype.focus = function(){
console.log('focused');
}
function HtmlSelectElement( items =[]){
this.items=items;
this.addItem = function(item){
this.items.push(item);
};
this.removeItem = function(item){
this.items.splice(this.items.indexOf(item),1);
};
this.render =function(){
return `<select>
${this.items.map(item =>`<option>${item}</option>`).join('')}
</select>`;
}
}
//HtmlSelectElement.prototype = Object.create(HtmlElement.prototype);
HtmlSelectElement.prototype = new HtmlElement();
HtmlSelectElement.prototype.constructor = HtmlSelectElement;
/*Excercise no 2*/
function HtmlImageElement(src){
this.src = src;
this.render = function(){
return `<img src="${this.src}"/>`;
}
}
HtmlImageElement.prototype = new HtmlElement;
HtmlImageElement.prototype.constructor = HtmlImageElement;
/*Excercise 3 Stack solution*/
const _items = new WeakMap();
class Stack{
constructor(){
_items.set(this,[]);
}
push(obj){
_items.get(this).push(obj);
}
pop(){
const items = _items.get(this);
if(items.length===0)
throw new Error('Stack is empty');
return items.pop();
}
peek(){
const items = _items.get(this);
if(items.length === 0)
throw new Error('Stack is empty');
return items[items.length-1];
}
get count(){
return _items.get(this).length;
}
}
const stack = new Stack;