On Promises

promises.js

new Promise( ( resolve, reject ) => {
    resolve('result');
})
.then(() => {console.log('resolved');}, () => {console.log('rejected');})
.catch(() => {console.log('error thrown');});
// resolved

new Promise( ( resolve, reject ) => {
    reject('error');
})
.then(() => {console.log('resolved');}, () => {console.log('rejected');})
.catch(() => {console.log('error thrown');});
// rejected

new Promise( ( resolve, reject ) => {
    throw 'error';
})
.then(() => {console.log('resolved');}, () => {console.log('rejected');})
.catch(() => {console.log('error thrown');});
// rejected

new Promise( ( resolve, reject ) => {
    reject('error');
})
.catch(() => {console.log('error thrown');});
// error thrown

new Promise( ( resolve, reject ) => {
    throw 'error';
})
.catch(() => {console.log('error thrown');});
// error thrown