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example-promise.js
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example-promise.js
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// 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);
// });
// Challenge Area
function addPromise (a, b) {
return new Promise(function (resolve, reject) {
if (typeof a === 'number' && typeof b === 'number') {
resolve(a + b);
} else {
reject('A & b need to be numbers');
}
});
}
addPromise(2, 3).then(function (sum) {
console.log('success', sum);
}, function (err) {
console.log('error', err);
});
addPromise('andrew', 9).then(function (sum) {
console.log('this should not show up');
}, function (err) {
console.log('This should appear', err);
});