example-promise.js

/*function getTempCallback(location, callback) {
    callback(undefined, 78);
    callback('city not found');
}

getTempCallback('Philadelphia', function(err, temp) {
    if (err) {
        console.log('error', err);
    } else {
        console.log('success', temp)
    }
});


function getTempPromise(location) {
    return new Promise(function(resolve, reject) {
        setTimeout(function(){
            resolve(79);
            reject('city not found');
        }, 1000);
    })
}

getTempPromise('Philadelphia').then(function(temp){
    console.log('promise success', temp);
}, function(err){
    console.log('promise error', err);
})*/

function addPromise(a, b) {
    return new Promise(function(resolve, reject) {
        if (typeof a === 'number' && typeof b === 'number') {
            resolve(a+b);
        }
        else {
            reject('these are not numbers');
        }
    })
}


addPromise(5, 2).then(function(result) {
    console.log('success! result is: ', result);
}, function(error){
    console.log('ouch. ', error);
});


addPromise(5, 'žblj').then(function(result) {
    console.log('success! result is: ', result);
}, function(error){
    console.log('ouch. ', error);
});