promise-sample.js

console.log('hoge');

Promise.resolve()
.then(function() {
    return new Promise(function(resolve) {
        setTimeout(function() {
            resolve('fuga');
        }, 1000);
    });
})
.then(function(message) {
    console.log(message);
})
.then(function(message) {
    return Promise.all([
        new Promise(function(resolve) {
            setTimeout(function() {
                resolve('foo');
            }, 2000);
        }),
        new Promise(function(resolve) {
            setTimeout(function() {
                resolve('bar');
            }, 3000);
        }),
    ]);
})
.then(function(message) {
    console.log(message);
})
.then(function(message) {
    return Promise.race([
        new Promise(function(_, reject) {
            setTimeout(function() {
                reject('bar');
            }, 2000);
        }),
        new Promise(function(resolve) {
            setTimeout(function() {
                resolve('baz');
            }, 3000);
        }),
    ]);
})
.then(function(message) {
    console.log('result: '+message);
})
.catch(function(cause) {
    console.log('error: '+cause);
});