81 lines
2 KiB
JavaScript
81 lines
2 KiB
JavaScript
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/** @license MIT License (c) copyright 2011-2013 original author or authors */
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/**
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* Licensed under the MIT License at:
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* http://www.opensource.org/licenses/mit-license.php
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*
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* @author Brian Cavalier
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* @author John Hann
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*/
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(function(define) { 'use strict';
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define(function(require) {
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var when = require('./when');
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var Promise = when.Promise;
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var toPromise = when.resolve;
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return {
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all: when.lift(all),
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map: map
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};
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/**
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* Resolve all the key-value pairs in the supplied object or promise
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* for an object.
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* @param {Promise|object} object or promise for object whose key-value pairs
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* will be resolved
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* @returns {Promise} promise for an object with the fully resolved key-value pairs
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*/
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function all(object) {
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var p = Promise._defer();
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var resolver = Promise._handler(p);
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var results = {};
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var keys = Object.keys(object);
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var pending = keys.length;
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for(var i=0, k; i<keys.length; ++i) {
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k = keys[i];
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Promise._handler(object[k]).fold(settleKey, k, results, resolver);
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}
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if(pending === 0) {
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resolver.resolve(results);
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}
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return p;
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function settleKey(k, x, resolver) {
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/*jshint validthis:true*/
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this[k] = x;
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if(--pending === 0) {
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resolver.resolve(results);
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}
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}
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}
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/**
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* Map values in the supplied object's keys
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* @param {Promise|object} object or promise for object whose key-value pairs
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* will be reduced
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* @param {function(value:*, key:String):*} f mapping function which may
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* return either a promise or a value
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* @returns {Promise} promise for an object with the mapped and fully
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* resolved key-value pairs
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*/
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function map(object, f) {
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return toPromise(object).then(function(object) {
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return all(Object.keys(object).reduce(function(o, k) {
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o[k] = toPromise(object[k]).fold(mapWithKey, k);
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return o;
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}, {}));
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});
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function mapWithKey(k, x) {
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return f(x, k);
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}
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}
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});
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})(typeof define === 'function' && define.amd ? define : function (factory) { module.exports = factory(require); });
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