npm-registry-mock
Version:
mock the npm registry
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Async.js\u000a\u000aAsync is a utility module which provides straight-forward, powerful functions\u000afor working with asynchronous JavaScript. Although originally designed for\u000ause with [node.js](http://nodejs.org), it can also be used directly in the\u000abrowser. Also supports [component](https://github.com/component/component).\u000a\u000aAsync provides around 20 functions that include the usual 'functional'\u000asuspects (map, reduce, filter, each…) as well as some common patterns\u000afor asynchronous control flow (parallel, series, waterfall…). All these\u000afunctions assume you follow the node.js convention of providing a single\u000acallback as the last argument of your async function.\u000a\u000a\u000a## Quick Examples\u000a\u000a```javascript\u000aasync.map(['file1','file2','file3'], fs.stat, function(err, results){\u000a // results is now an array of stats for each file\u000a});\u000a\u000aasync.filter(['file1','file2','file3'], fs.exists, function(results){\u000a // results now equals an array of the existing files\u000a});\u000a\u000aasync.parallel([\u000a function(){ ... },\u000a function(){ ... }\u000a], callback);\u000a\u000aasync.series([\u000a function(){ ... },\u000a function(){ ... }\u000a]);\u000a```\u000a\u000aThere are many more functions available so take a look at the docs below for a\u000afull list. This module aims to be comprehensive, so if you feel anything is\u000amissing please create a GitHub issue for it.\u000a\u000a## Common Pitfalls\u000a\u000a### Binding a context to an iterator\u000a\u000aThis section is really about bind, not about async. If you are wondering how to\u000amake async execute your iterators in a given context, or are confused as to why\u000aa method of another library isn't working as an iterator, study this example:\u000a\u000a```js\u000a// Here is a simple object with an (unnecessarily roundabout) squaring method\u000avar AsyncSquaringLibrary = {\u000a squareExponent: 2,\u000a square: function(number, callback){ \u000a var result = Math.pow(number, this.squareExponent);\u000a setTimeout(function(){\u000a callback(null, result);\u000a }, 200);\u000a }\u000a};\u000a\u000aasync.map([1, 2, 3], AsyncSquaringLibrary.square, function(err, result){\u000a // result is [NaN, NaN, NaN]\u000a // This fails because the `this.squareExponent` expression in the square\u000a // function is not evaluated in the context of AsyncSquaringLibrary, and is\u000a // therefore undefined.\u000a});\u000a\u000aasync.map([1, 2, 3], AsyncSquaringLibrary.square.bind(AsyncSquaringLibrary), function(err, result){\u000a // result is [1, 4, 9]\u000a // With the help of bind we can attach a context to the iterator before\u000a // passing it to async. Now the square function will be executed in its \u000a // 'home' AsyncSquaringLibrary context and the value of `this.squareExponent`\u000a // will be as expected.\u000a});\u000a```\u000a\u000a## Download\u000a\u000aThe source is available for download from\u000a[GitHub](http://github.com/caolan/async).\u000aAlternatively, you can install using Node Package Manager (npm):\u000a\u000a npm install async\u000a\u000a__Development:__ [async.js](https://github.com/caolan/async/raw/master/lib/async.js) - 29.6kb Uncompressed\u000a\u000a## In the Browser\u000a\u000aSo far it's been tested in IE6, IE7, IE8, FF3.6 and Chrome 5. Usage:\u000a\u000a```html\u000a<script type=\"text/javascript\" src=\"async.js\"></script>\u000a<script type=\"text/javascript\">\u000a\u000a async.map(data, asyncProcess, function(err, results){\u000a alert(results);\u000a });\u000a\u000a</script>\u000a```\u000a\u000a## Documentation\u000a\u000a### Collections\u000a\u000a* [each](#each)\u000a* [eachSeries](#eachSeries)\u000a* [eachLimit](#eachLimit)\u000a* [map](#map)\u000a* [mapSeries](#mapSeries)\u000a* [mapLimit](#mapLimit)\u000a* [filter](#filter)\u000a* [filterSeries](#filterSeries)\u000a* [reject](#reject)\u000a* [rejectSeries](#rejectSeries)\u000a* [reduce](#reduce)\u000a* [reduceRight](#reduceRight)\u000a* [detect](#detect)\u000a* [detectSeries](#detectSeries)\u000a* [sortBy](#sortBy)\u000a* [some](#some)\u000a* [every](#every)\u000a* [concat](#concat)\u000a* [concatSeries](#concatSeries)\u000a\u000a### Control Flow\u000a\u000a* [series](#series)\u000a* [parallel](#parallel)\u000a* [parallelLimit](#parallellimittasks-limit-callback)\u000a* [whilst](#whilst)\u000a* [doWhilst](#doWhilst)\u000a* [until](#until)\u000a* [doUntil](#doUntil)\u000a* [forever](#forever)\u000a* [waterfall](#waterfall)\u000a* [compose](#compose)\u000a* [applyEach](#applyEach)\u000a* [applyEachSeries](#applyEachSeries)\u000a* [queue](#queue)\u000a* [cargo](#cargo)\u000a* [auto](#auto)\u000a* [iterator](#iterator)\u000a* [apply](#apply)\u000a* [nextTick](#nextTick)\u000a* [times](#times)\u000a* [timesSeries](#timesSeries)\u000a\u000a### Utils\u000a\u000a* [memoize](#memoize)\u000a* [unmemoize](#unmemoize)\u000a* [log](#log)\u000a* [dir](#dir)\u000a* [noConflict](#noConflict)\u000a\u000a\u000a## Collections\u000a\u000a<a name=\"forEach\" />\u000a<a name=\"each\" />\u000a### each(arr, iterator, callback)\u000a\u000aApplies an iterator function to each item in an array, in parallel.\u000aThe iterator is called with an item from the list and a callback for when it\u000ahas finished. If the iterator passes an error to this callback, the main\u000acallback for the each function is immediately called with the error.\u000a\u000aNote, that since this function applies the iterator to each item in parallel\u000athere is no guarantee that the iterator functions will complete in order.\u000a\u000a__Arguments__\u000a\u000a* arr - An array to iterate over.\u000a* iterator(item, callback) - A function to apply to each item in the array.\u000a The iterator is passed a callback(err) which must be called once it has \u000a completed. If no error has occured, the callback should be run without \u000a arguments or with an explicit null argument.\u000a* callback(err) - A callback which is called after all the iterator functions\u000a have finished, or an error has occurred.\u000a\u000a__Example__\u000a\u000a```js\u000a// assuming openFiles is an array of file names and saveFile is a function\u000a// to save the modified contents of that file:\u000a\u000aasync.each(openFiles, saveFile, function(err){\u000a // if any of the saves produced an error, err would equal that error\u000a});\u000a```\u000a\u000a---------------------------------------\u000a\u000a<a name=\"forEachSeries\" />\u000a<a name=\"eachSeries\" />\u000a### eachSeries(arr, iterator, callback)\u000a\u000aThe same as each only the iterator is applied to each item in the array in\u000aseries. The next iterator is only called once the current one has completed\u000aprocessing. This means the iterator functions will complete in order.\u000a\u000a\u000a---------------------------------------\u000a\u000a<a name=\"forEachLimit\" />\u000a<a name=\"eachLimit\" />\u000a### eachLimit(arr, limit, iterator, callback)\u000a\u000aThe same as each only no more than \"limit\" iterators will be simultaneously \u000arunning at any time.\u000a\u000aNote that the items are not processed in batches, so there is no guarantee that\u000a the first \"limit\" iterator functions will complete before any others are \u000astarted.\u000a\u000a__Arguments__\u000a\u000a* arr - An array to iterate over.\u000a* limit - The maximum number of iterators to run at any time.\u000a* iterator(item, callback) - A function to apply to each item in the array.\u000a The iterator is passed a callback(err) which must be called once it has \u000a completed. If no error has occured, the callback should be run without \u000a arguments or with an explicit null argument.\u000a* callback(err) - A callback which is called after all the iterator functions\u000a have finished, or an error has occurred.\u000a\u000a__Example__\u000a\u000a```js\u000a// Assume documents is an array of JSON objects and requestApi is a\u000a// function that interacts with a rate-limited REST api.\u000a\u000aasync.eachLimit(documents, 20, requestApi, function(err){\u000a // if any of the saves produced an error, err would equal that error\u000a});\u000a```\u000a\u000a---------------------------------------\u000a\u000a<a name=\"map\" />\u000a### map(arr, iterator, callback)\u000a\u000aProduces a new array of values by mapping each value in the given array through\u000athe iterator function. The iterator is called with an item from the array and a\u000acallback for when it has finished processing. The callback takes 2 arguments, \u000aan error and the transformed item from the array. If the iterator passes an\u000aerror to this callback, the main callback for the map function is immediately\u000acalled with the error.\u000a\u000aNote, that since this function applies the iterator to each item in parallel\u000athere is no guarantee that the iterator functions will complete in order, however\u000athe results array will be in the same order as the original array.\u000a\u000a__Arguments__\u000a\u000a* arr - An array to iterate over.\u000a* iterator(item, callback) - A function to apply to each item in the array.\u000a The iterator is passed a callback(err, transformed) which must be called once \u000a it has completed with an error (which can be null) and a transformed item.\u000a* callback(err, results) - A callback which is called after all the iterator\u000a functions have finished, or an error has occurred. Results is an array of the\u000a transformed items from the original array.\u000a\u000a__Example__\u000a\u000a```js\u000aasync.map(['file1','file2','file3'], fs.stat, function(err, results){\u000a // results is now an array of stats for each file\u000a});\u000a```\u000a\u000a---------------------------------------\u000a\u000a<a name=\"mapSeries\" />\u000a### mapSeries(arr, iterator, callback)\u000a\u000aThe same as map only the iterator is applied to each item in the array in\u000aseries. The next iterator is only called once the current one has completed\u000aprocessing. The results array will be in the same order as the original.\u000a\u000a\u000a---------------------------------------\u000a\u000a<a name=\"mapLimit\" />\u000a### mapLimit(arr, limit, iterator, callback)\u000a\u000aThe same as map only no more than \"limit\" iterators will be simultaneously \u000arunning at any time.\u000a\u000aNote that the items are not processed in batches, so there is no guarantee that\u000a the first \"limit\" iterator functions will complete before any others are \u000astarted.\u000a\u000a__Arguments__\u000a\u000a* arr - An array to iterate over.\u000a* limit - The maximum number of iterators to run at any time.\u000a* iterator(item, callback) - A function to apply to each item in the array.\u000a The iterator is passed a callback(err, transformed) which must be called once \u000a it has completed with an error (which can be null) and a transformed item.\u000a* callback(err, results) - A callback which is called after all the iterator\u000a functions have finished, or an error has occurred. Results is an array of the\u000a transformed items from the original array.\u000a\u000a__Example__\u000a\u000a```js\u000aasync.mapLimit(['file1','file2','file3'], 1, fs.stat, function(err, results){\u000a // results is now an array of stats for each file\u000a});\u000a```\u000a\u000a---------------------------------------\u000a\u000a<a name=\"filter\" />\u000a### filter(arr, iterator, callback)\u000a\u000a__Alias:__ select\u000a\u000aReturns a new array of all the values which pass an async truth test.\u000a_The callback for each iterator call only accepts a single argument of true or\u000afalse, it does not accept an error argument first!_ This is in-line with the\u000away node libraries work with truth tests like fs.exists. This operation is\u000aperformed in parallel, but the results array will be in the same order as the\u000aoriginal.\u000a\u000a__Arguments__\u000a\u000a* arr - An array to iterate over.\u000a* iterator(item, callback) - A truth test to apply to each item in the array.\u000a The iterator is passed a callback(truthValue) which must be called with a \u000a boolean argument once it has completed.\u000a* callback(results) - A callback which is called after all the iterator\u000a functions have finished.\u000a\u000a__Example__\u000a\u000a```js\u000aasync.filter(['file1','file2','file3'], fs.exists, function(results){\u000a // results now equals an array of the existing files\u000a});\u000a```\u000a\u000a---------------------------------------\u000a\u000a<a name=\"filterSeries\" />\u000a### filterSeries(arr, iterator, callback)\u000a\u000a__alias:__ selectSeries\u000a\u000aThe same as filter only the iterator is applied to each item in the array in\u000aseries. The next iterator is only called once the current one has completed\u000aprocessing. The results array will be in the same order as the original.\u000a\u000a---------------------------------------\u000a\u000a<a name=\"reject\" />\u000a### reject(arr, iterator, callback)\u000a\u000aThe opposite of filter. Removes values that pass an async truth test.\u000a\u000a---------------------------------------\u000a\u000a<a name=\"rejectSeries\" />\u000a### rejectSeries(arr, iterator, callback)\u000a\u000aThe same as reject, only the iterator is applied to each item in the array\u000ain series.\u000a\u000a\u000a---------------------------------------\u000a\u000a<a name=\"reduce\" />\u000a### reduce(arr, memo, iterator, callback)\u000a\u000a__aliases:__ inject, foldl\u000a\u000aReduces a list of values into a single value using an async iterator to return\u000aeach successive step. Memo is the initial state of the reduction. This\u000afunction only operates in series. For performance reasons, it may make sense to\u000asplit a call to this function into a parallel map, then use the normal\u000aArray.prototype.reduce on the results. This function is for situations where\u000aeach step in the reduction needs to be async, if you can get the data before\u000areducing it then it's probably a good idea to do so.\u000a\u000a__Arguments__\u000a\u000a* arr - An array to iterate over.\u000a* memo - The initial state of the reduction.\u000a* iterator(memo, item, callback) - A function applied to each item in the\u000a array to produce the next step in the reduction. The iterator is passed a\u000a callback(err, reduction) which accepts an optional error as its first \u000a argument, and the state of the reduction as the second. If an error is \u000a passed to the callback, the reduction is stopped and the main callback is \u000a immediately called with the error.\u000a* callback(err, result) - A callback which is called after all the iterator\u000a functions have finished. Result is the reduced value.\u000a\u000a__Example__\u000a\u000a```js\u000aasync.reduce([1,2,3], 0, function(memo, item, callback){\u000a // pointless async:\u000a process.nextTick(function(){\u000a callback(null, memo + item)\u000a });\u000a}, function(err, result){\u000a // result is now equal to the last value of memo, which is 6\u000a});\u000a```\u000a\u000a---------------------------------------\u000a\u000a<a name=\"reduceRight\" />\u000a### reduceRight(arr, memo, iterator, callback)\u000a\u000a__Alias:__ foldr\u000a\u000aSame as reduce, only operates on the items in the array in reverse order.\u000a\u000a\u000a---------------------------------------\u000a\u000a<a name=\"detect\" />\u000a### detect(arr, iterator, callback)\u000a\u000aReturns the first value in a list that passes an async truth test. The\u000aiterator is applied in parallel, meaning the first iterator to return true will\u000afire the detect callback with that result. That means the result might not be\u000athe first item in the original array (in terms of order) that passes the test.\u000a\u000aIf order within the original array is important then look at detectSeries.\u000a\u000a__Arguments__\u000a\u000a* arr - An array to iterate over.\u000a* iterator(item, callback) - A truth test to apply to each item in the array.\u000a The iterator is passed a callback(truthValue) which must be called with a \u000a boolean argument once it has completed.\u000a* callback(result) - A callback which is called as soon as any iterator returns\u000a true, or after all the iterator functions have finished. Result will be\u000a the first item in the array that passes the truth test (iterator) or the\u000a value undefined if none passed.\u000a\u000a__Example__\u000a\u000a```js\u000aasync.detect(['file1','file2','file3'], fs.exists, function(result){\u000a // result now equals the first file in the list that exists\u000a});\u000a```\u000a\u000a---------------------------------------\u000a\u000a<a name=\"detectSeries\" />\u000a### detectSeries(arr, iterator, callback)\u000a\u000aThe same as detect, only the iterator is applied to each item in the array\u000ain series. This means the result is always the first in the original array (in\u000aterms of array order) that passes the truth test.\u000a\u000a\u000a---------------------------------------\u000a\u000a<a name=\"sortBy\" />\u000a### sortBy(arr, iterator, callback)\u000a\u000aSorts a list by the results of running each value through an async iterator.\u000a\u000a__Arguments__\u000a\u000a* arr - An array to iterate over.\u000a* iterator(item, callback) - A function to apply to each item in the array.\u000a The iterator is passed a callback(err, sortValue) which must be called once it\u000a has completed with an error (which can be null) and a value to use as the sort\u000a criteria.\u000a* callback(err, results) - A callback which is called after all the iterator\u000a functions have finished, or an error has occurred. Results is the items from\u000a the original array sorted by the values returned by the iterator calls.\u000a\u000a__Example__\u000a\u000a```js\u000aasync.sortBy(['file1','file2','file3'], function(file, callback){\u000a fs.stat(file, function(err, stats){\u000a callback(err, stats.mtime);\u000a });\u000a}, function(err, results){\u000a // results is now the original array of files sorted by\u000a // modified date\u000a});\u000a```\u000a\u000a---------------------------------------\u000a\u000a<a name=\"some\" />\u000a### some(arr, itera