javascript lesson

promise.js

'use strict';

const f = ( x, r ) => {

    return Promise[ r ]( 2 * x )
        .then( y => {

            throw y;
        },
        z => {

            throw z + 2;
        })
        .catch( w => {

            console.log( w );
        });
}

f( 3, 'resolve' );
// logs 6

f( 3, 'reject' );
// logs 8