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MooTools Promise.Series map/reduce
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| (function(){ | |
| this.Promise = new Class({ | |
| Implements: Class.Thenable, | |
| initialize: function(promise) { | |
| if (typeof promise !== 'function') | |
| throw new TypeError('Promise accepts only a function constructor!'); | |
| try { | |
| promise(this.resolve.bind(this), this.reject.bind(this)); | |
| } catch (e) { | |
| this.reject(e); | |
| } | |
| } | |
| }); | |
| this.Promise.Series = new Class({ | |
| Implements: Class.Thenable, | |
| initialize: function(promises) { | |
| if (typeOf(promises) != "array") | |
| throw new TypeError('Promise Series accepts only an array of functions returning promises as constructor!'); | |
| var ret = new Promise(function(fn, err) {}).resolve(null); | |
| var results = []; | |
| return promises.reduce(function(result, promise, index) { | |
| return result.then(function() { | |
| return promise().then(function(val) { | |
| results[index] = val; | |
| }); | |
| }); | |
| }, ret).then(function() { | |
| return results; | |
| }); | |
| } | |
| }); | |
| })(); | |
| //USAGE: | |
| new Promise.Series([ | |
| function(){ | |
| return new Promise(function(resolve, reject){ | |
| setTimeout(function(){ | |
| console.log('a resolving.') | |
| resolve('a'); | |
| },3000); | |
| }) | |
| }, | |
| function(){ | |
| return new Promise(function(resolve, reject){ | |
| setTimeout(function(){ | |
| console.log('b resolving.') | |
| resolve('b'); | |
| },1000); | |
| }) | |
| } | |
| ]).then(function(results){ | |
| console.log('Results in execution order:',results); | |
| }).catch(function(e){ | |
| console.error('Rejection based on:', e); | |
| }); |
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