bench parallel is an ideal promise library that I created to improve inefficiencies that I noticed when using other promise libraries like . On top of being an impressive benchmark exercise, it is a production-ready library that implements the Promise A+ standard. [Aigle](https://github.com/suguru03/aigle) Bluebird Benchmark indicates that is faster than . This was achieved by avoiding unnecessary memory allocation and function calls. For instance, is able to optimize it’s dependencies while Bluebird’s performance is affected if it’s dependencies use different versions of it. For more information on how is faster than , I would encourage you to read on it. The above benchmark exercises Aigle Bluebird Aigle Aigle Bluebird my article Functions makes your code less verbose and contains many functions similar to and . As a result, you would be able to code faster and have a much easier time maintaining code. Aigle [Lodash](https://github.com/lodash/lodash) [Async](https://github.com/caolan/async) Aigle.map vs Bluebird.map Compared to , is 1.5x faster and also supports an object as a first argument unlike . Bluebird.map Aigle.map Bluebird.map const object = {a: 1,b: 2,c: 3};Blubird.map(Object.keys(object), key => {const value = object[key];...});Aigle.map(object, (value, key) => { ... }); If you want to use concurrency, has which is similar to . Aigle Aigle.mapLimit Async.mapLimit const array = [1, 2, 3, 4, 5];Bluebird.map(array, value => {console.log(value); // 1, 2, 5, 4, 3 the order is not ensuredreturn Bluebird.delay(10);}, { concurrency: 2 }); Aigle.mapLimit(array, 2, value => {console.log(value); // 1, 2, 3, 4, 5 the order is ensuredreturn Aigle.delay(10);}); // you could use default limit, the limit is 8Aigle.mapLimit(array, value => {console.log(value); // 1, 2, 3, 4, 5return Aigle.delay(10);}); In addition, supports shorthand notation similar to for cleaner code. Aigle Lodash const array = [{ name: 'barney' }, { name: 'fred' }];Aigle.resolve(array).map('name') // the function is called asynchronously.then(names => console.log(names)); // ['barney', 'fred'] Aigle.mapValues The function is similar to and . It is also similar to , but it returns an object instead. Below is a code comparision between and . Async.mapValues Lodash.mapValues Aigle.map Aigle Bluebird const object = { a: 1, b: 2, c: 3 };const iterator = value => Promise.resolve(value * 2); // Bluebirdconst result = {};Bluebird.each(Object.keys(object), key => {const value = object[key];return iterator(value).then(val => {result[key] = val;});}).then(() => console.log(result)); // { a: 2, b: 4, c: 6 } // AigleAigle.mapValues(object, iterator).then(result => console.log(result)); // { a: 2, b: 4, c: 6 } Aigle.times The function is similar to and . It calls an iterator specified times. Async.times Lodash.times const n = 10;const iterator = value => Promise.resolve(value * 2); // Bluebirdconst times = [];for (let i = 0; i < n; i++) {times.push(i);}Bluebird.map(times, iterator).then(result => console.log(result)); // [0, 2, 4, ..., 18] // AigleAigle.times(n, iterator).then(result => console.log(result)); // [0, 2, 4, ..., 18] Conclusion is a promise library that provides safer, less verbose, and maintainable code that boasts impressive benchmarks. The documented examples above are only a subset of 's functions. If you are already familiar with or , you will be able to easily transition into writing even more readable code with . With that said, let’s enjoy writing faster and more efficient Javascript using . Aigle Aigle Lodash Async Aigle Aigle Reference Aigle Bluebird

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Aigle vs Bluebird

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Suguru Motegi

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