04_objects_inheritance.js

// Primitive value: string, number, boolean, null, undefined

// Object: myObject --> Object.prototype --> null
// Array: myArray --> Array.prototype --> Object.prototype --> null
// Function: myFunc --> Function.prototype --> Object.prototype --> null
// String: myString --> String.prototype --> Object.prototype --> null
// Number: myNumber --> Number.prototype --> Object.prototype --> null
// Boolean: myBoolean --> Boolean.prototype --> Object.prototype --> null

const product = 'Computer'
console.log(product)

const otherProduct = new String('Phone')
console.log(otherProduct)


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

const Product = {
    name1: 'test'
}

console.log(Product.hasOwnProperty('name1'))
console.log(Product.hasOwnProperty('name2'))


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

Object.prototype.someNewMethod = () => 'this is a new function which is now available for all objects as all objects extend from object class'

const Product2 = {}
console.log(Product2.someNewMethod());


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

class Person {
    constructor(firstName, lastName, age, likes = []) {
        this.firstName = firstName
        this.lastName = lastName
        this.age = age
        this.likes = likes
    }
    getBio() {
        let bio = `${this.firstName} is ${this.age}.`

        this.likes.forEach((like) => {
            bio += ` ${this.firstName} likes ${like}.`
        })

        return bio
    }
    setName(fullName) {
        const names = fullName.split(' ')
        this.firstName = names[0]
        this.lastName = names[1]
    }
}

class Employee extends Person {
    constructor(firstName, lastName, age, position, likes) {
        super(firstName, lastName, age, likes)
        this.position = position
    }
    getBio() {
        return `${this.firstName} ${this.lastName} is a ${this.position}.`
    }
    getYearsLeft() {
        return 65 - this.age
    }
}

class Student extends Person {
    constructor(firstName, lastName, age, grade, likes) {
        super(firstName, lastName, age, likes)
        this.grade = grade
    }
    updateGrade(change) {
        this.grade += change
    }
    getBio() {
        const status = this.grade >= 70 ? 'passing' : 'failing'
        return `${this.firstName} is ${status} the class.`
    }
}

const me = new Student('Andrew', 'Mead', 27, 88, [])
console.log(me.getBio())
me.updateGrade(-20)
console.log(me.getBio())

//------------------------------------------------------------------------------------------------------------------------------
//getters and setters for objects

const data = {
    locations: [],
    get location() {
        return this._location
    },
    set location(value) {
        this._location = value.trim()
        this.locations.push(this._location)
    }
}

// code that uses the data object
data.location = '  Philadelphia    '
data.location = ' New York'
console.log(data)


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