generators.js

/*
function* shopping() {
    // stuff on the sidewalk
    
    // walking down the sidewalk
    
    //go into the store with cash
    const stuffFromStore = yield 'cash';

    //walking to laundry place
    const cleanClothes = yield 'laundry';

    // walking back home
    return [ stuffFromStore, cleanClothes ];

}
// stuff in the store
const gen = shopping();
console.log(gen.next()); // leaving our house

// walked into the store
// walking up and down the aisles...
// purchasing our stuff

console.log(gen.next('groceries')); //leaving the store with groceries.
console.log(gen.next('clean clothes')); //leaving the laundry place with clean clothes.
*/

// ============================================
/*
function* colors() {
    yield 'red',
    yield 'blue',
    yield 'green'
}


const gen = colors();
console.log(gen.next());
console.log(gen.next());
console.log(gen.next());
console.log(gen.next());



const myColors = [];

// for of loop works with generators
for (let color of colors()) {
    myColors.push(color);
}

console.log(myColors);
*/
// ==========================================
/*
const testingTeam = {
    lead: 'Amanda',
    tester: 'Bill',
    [Symbol.iterator]: function* () {
        yield this.lead;
        yield this.tester;
    }
};

const engineeringTeam = {
    testingTeam,
    size: 3,
    department: 'Engineering',
    lead: 'Jill',
    manager: 'Alex',
    engineer: 'Dave',
    [Symbol.iterator]: function* () {
        yield this.lead;
        yield this.manager;
        yield this.engineer;
        yield* this.testingTeam;
    }
};

const names = [];
for (let name of engineeringTeam) {
    names.push(name);
}

console.log(names);
*/

// ===================================

class Comment {
    constructor(content, children) {
        this.content = content;
        this.children = children;
    }

    *[Symbol.iterator]() {
        yield this.content;
        for (let child of this.children) {
            yield* child;
        }
    }
}

const children = [
    new Comment('good comment', []),
    new Comment('bad comment', []),
    new Comment('meh', [])
];

const tree = new Comment('Great post!', children)

const values = [];
for (let value of tree) {
    values.push(value);
}
console.log(values);