chaining-promises.txt

gistfile1.txt

// chaining then. chain is then -> catch -> then

// case 1: promise is resolved
new Promise((resolve, reject) => resolve("some data")).then(data => { alert(`data: ${data}`); return data; }).catch(err => { alert(`err: ${err}`); return Promise.reject(err); }).then(data => { alert(`data again: ${data}`); return data; })

// case 2: promise is rejected
new Promise((resolve, reject) => resolve("some data")).then(data => { alert(`data: ${data}`); return data; }).catch(err => { alert(`err: ${err}`); return Promise.reject(err); }).then(data => { alert(`data again: ${data}`); return data; })