Created
January 6, 2017 14:30
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function executeAllPromises(promises) { | |
// Wrap all Promises in a Promise that will always "resolve" | |
var resolvingPromises = promises.map(function(promise) { | |
return new Promise(function(resolve, reject) { | |
var payload = new Array(2); | |
promise.then(function(result) { | |
payload[0] = result; | |
}) | |
.catch(function(error) { | |
payload[1] = error; | |
}) | |
.then(function() { | |
/* | |
* The wrapped Promise returns an array: | |
* The first position in the array holds the result (if any) | |
* The second position in the array holds the error (if any) | |
*/ | |
resolve(payload); | |
}); | |
}); | |
}); | |
var errors = []; | |
var results = []; | |
// Execute all wrapped Promises | |
return Promise.all(resolvingPromises) | |
.then(function(items) { | |
items.forEach(function(payload) { | |
if (payload[1]) { | |
errors.push(payload[1]); | |
} else { | |
results.push(payload[0]); | |
} | |
}); | |
return { | |
errors: errors, | |
results: results | |
}; | |
}); | |
} | |
var myPromises = [ | |
Promise.resolve(1), | |
Promise.resolve(2), | |
Promise.reject(new Error('3')), | |
Promise.resolve(4), | |
Promise.reject(new Error('5')) | |
]; | |
executeAllPromises(myPromises).then(function(items) { | |
console.log(`Executed all ${myPromises.length} Promises:`); | |
console.log(`— ${items.results.length} Promises were successful.`, items.results); | |
console.log(`— ${items.errors.length} Promises failed.`, items.errors); | |
}); |
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