const myPromise = new Promise((resolve) => {

resolve(12);

}).then((value) => {

console.log(value);

});

const myPromiseValue = Promise.resolve(12);

const myRejectedPromise = Promise.reject(new Error('rejected'));

myRejectedPromise.catch((error) => {

console.log(error);

});

function wait(seconds) {

return new Promise((resolve) => {

setTimeout(() => {

resolve(seconds);

}, seconds * 1000);

})

}

function waitCallback(seconds, callback) {

setTimeout(callback, seconds * 1000);

}

wait(2).then((seconds) => {

console.log('i waited ' + seconds + ' seconds');

});

wait(2)

.then(() => wait(2))

.then(() => {

console.log('i waited 4 seconds');

});