generator-function-es6

gen-func.js

// const fetch = require("node-fetch"); // npm install fetchAPI for Node.js

run(function*() {
  const uri = 'https://jsonplaceholder.typicode.com/todos/1';
  const response = yield fetch(uri); // first stop
  const resJSON = yield response.json(); // second stop
  console.log(resJSON);
});

// take care of the generator function
function run(generator) {
  const iterator = generator();
  const iteration = iterator.next(); // runs generator [first YIELD]
  const promise = iteration.value;
  promise.then(response => {
    const iteration2 = iterator.next(response); // runs generator again [second YIELD]
    const promise2 = iteration2.value;
    promise2.then(response2 => {
      iterator.next(response2);
    })
  });
}