Generator and Iterators Example

generatorAndIterators.js

const fetch = require('node-fetch');
const co = require('co');

/*
	fetch('https://jsonplaceholder.typicode.com/posts/2')
		.then(res => res.json())
		.then(res => console.log(title));
*/
	
// Trying to implement above function using generator and iterator

// Used co library
co(function *(){
	const url = 'https://jsonplaceholder.typicode.com/posts/2';
	const res = yield fetch(url);
	const post = yield res.json();
	const title = post.title;
	console.log(title);
})

// Implement co library to looking behind the scene how co library work
run(function *() {
	const url = 'https://jsonplaceholder.typicode.com/posts/2';
	const res = yield fetch(url);
	const post = yield res.json();
	const title = post.title;
	console.log(title);
});

function run(generator){
	const iterator = generator();
	const iteration = iterator.next();
	const promise = iteration.value;
	promise
		.then(res => iterator.next(res))
}