inherit-compose.js

// inherit-compose.js
// Inheritance vs Composition

//INHERITANCE
//  Character > Human > Sam
//  Character > Robot > x73
//  Character > Cyborg > Dolph

const Character = {
    talk: function(...msg){ 
        console.log( msg.join(' ') ) 
    }
}

const Human = Object.create(Character, {
    speed: {value:3},
    name: {value:'Hector'}
});
Human.walk= function(){ 
    this.talk(this.name, 'walking') 
};
Human.eat= function(){ 
    this.talk(this.name, 'eating') 
};

const Robot = Object.create(Character, {
    speed: {value:8},
    id: {value:'THX1138'}
});
Robot.drive= function (){ 
    this.talk(this.id, '\u26A1', 'driving')
};
Robot.wifi= function (){ 
    this.talk(this.id, '\u26A1', 'connecting')
};

const sam = Object.create(Human, 
                          {name:{value: 'Samuel'}});
sam.walk();
sam.talk('Hello from Samuel.');

const x73 = Object.create(Robot, 
                          {id:{value: 'x73'}});
x73.drive();
x73.wifi();
// ????What about a Cybernetically enhanced human with wifi?



//COMPOSITION
const talker = (state)=>({ 
    talk: (...msg)=> console.log( msg.join(' '))
});
const walker = (state) => ({
    walk: ()=> {
        let nm = state.name || state.id;
        console.log(nm, 'walking');
    }
});
const eater = (state) => ({
    eat: ()=> {
        let nm = state.name || state.id;
        console.log(nm, 'eating');
    }
});
const driver = (state) => ({
    drive: ()=>{
        let nm = state.name || state.id;
        console.log(nm, '\u26A1', 'driving');
    }
});
const wifier = (state) => ({
    wifi: ()=>{
        let nm = state.name || state.id;
        console.log(nm, '\u26A1', 'connecting');
    }
});

const Person = (name, speed=3) => {
    let state = {
        name,
        speed
    }
    return Object.assign({}, 
                         talker(state), 
                         walker(state), 
                         eater(state));
};
let Bob = Person('Bob');
Bob.talk('Hello from Bob.');
Bob.eat();
Bob.walk();

const Android = (id, speed=6) => {
    let state = {
        id,
        speed
    }
    return Object.assign({}, 
                         talker(state), 
                         driver(state), 
                         wifier(state));
};
let k45 = Android('k45');
k45.drive();
k45.wifi();

const Cyborg = (name, speed) => {
    let state = {
        name,
        speed
    };
    return Object.assign({},
                        talker(state),
                        walker(state),
                        wifier(state));
};
let Dolph = Cyborg('Dolph', 9);
Dolph.walk();
Dolph.wifi();