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\n \n \n \n

\n\n# now-and-later\n\n[![NPM version][npm-image]][npm-url] [![Downloads][downloads-image]][npm-url] [![Build Status][travis-image]][travis-url] [![AppVeyor Build Status][appveyor-image]][appveyor-url] [![Coveralls Status][coveralls-image]][coveralls-url] [![Gitter chat][gitter-image]][gitter-url]\n\nMap over an array or object of values in parallel or series, passing each through the async iterator, with optional lifecycle hooks.\n\n## Usage\n\n```js\nvar nal = require('now-and-later');\n\nfunction iterator(value, key, cb){\n // called with each value in sequence\n // also passes the key\n cb(null, value * 2)\n}\n\nfunction create(value, key){\n // called at the beginning of every iteration\n // return a storage object to be passed to each lifecycle method\n return { key: key, value: value };\n}\n\nfunction before(storage){\n // called before the iterator function of every iteration\n // receives the storage returned from `create`\n}\n\nfunction after(result, storage){\n // called after a success occurs in the iterator function of any iteration\n // receives the `result` of the iterator and the storage returned from `create`\n}\n\nfunction error(error, storage){\n // called after an error occurs in the iterator function of any iteration\n // receives the `error` of the iterator and the storage returned from `create`\n}\n\nfunction done(error, results) {\n // called after all iterations complete or an error occurs in an iterator\n // receives an `error` if one occurred and all results (or partial results upon error) of the iterators\n}\n\n/*\n Calling mapSeries with an object can't guarantee order\n It uses Object.keys to get an order\n It is better to use an array if order must be guaranteed\n */\nnal.mapSeries([1, 2, 3], iterator, {\n create: create,\n before: before,\n after: after,\n error: error\n}, done);\n\nnal.map({\n iter1: 1,\n iter2: 2\n}, iterator, {\n create: create,\n before: before,\n after: after,\n error: error\n}, done);\n```\n\n## API\n\n### `map(values, iterator[, extensions][, callback])`\n\nTakes an object or array of `values` and an `iterator` function to execute with each value.\nOptionally, takes an `extensions` object and a `callback` function that is called upon completion of the iterations.\n\nAll iterations run in parallel.\n\n#### `values`\n\nAn array or object of values to iterate over.\n\nIf `values` is an array, iterations are started in order by index. If `values` is an object, iterations are started in order by the order returned by `Object.keys` (order is not guaranteed).\n\nIf `values` is an array, the results of each iteration will be mapped to an array. If `values` is an object, the results of each iteration will be mapped to an object with corresponding keys.\n\n#### `iterator(value, key, done)`\n\nAn async function called per iteration. All iterations are run in parallel.\n\nThe `iterator` function is called once with each `value`, `key` and a function (`done(error, result)`) to call when the async work is complete.\n\nIf `done` is passed an error as the first argument, the iteration will fail and the sequence will be ended; however, any iterations in progress will still complete. If `done` is passed a `result` value as the second argument, it will be added to the final results array or object.\n\n#### `extensions`\n\nThe `extensions` object is used for specifying functions that give insight into the lifecycle of each iteration. The possible extension points are `create`, `before`, `after` and `error`. If an extension point is not specified, it defaults to a no-op function.\n\n##### `extensions.create(value, key)`\n\nCalled at the very beginning of each iteration with the `value` being iterated and the `key` from the array or object. If `create` returns a value (`storage`), it is passed to the `before`, `after` and `error` extension points.\n\nIf a value is not returned, an empty object is used as `storage` for each other extension point.\n\nThis is useful for tracking information across an iteration.\n\n##### `extensions.before(storage)`\n\nCalled immediately before each iteration with the `storage` value returned from the `create` extension point.\n\n##### `extensions.after(result, storage)`\n\nCalled immediately after each iteration with the `result` of the iteration and the `storage` value returned from the `create` extension point.\n\n##### `extensions.error(error, storage)`\n\nCalled immediately after a failed iteration with the `error` of the iteration and the `storage` value returned from the `create` extension point.\n\n#### `callback(error, results)`\n\nA function that is called after all iterations have completed or one iteration has errored.\n\nIf all iterations completed successfully, the `error` argument will be empty and the `results` will be a mapping of the `iterator` results.\n\nIf an iteration errored, the `error` argument will be passed from that iteration and the `results` will be whatever partial results had completed successfully before the error occurred.\n\n### `mapSeries(values, iterator[, extensions][, callback])`\n\nTakes an object or array of `values` and an `iterator` function to execute with each value.\nOptionally, takes an `extensions` object and a `callback` function that is called upon completion of the iterations.\n\nAll iterations run in serial.\n\n#### `values`\n\nAn array or object of values to iterate over.\n\nIf `values` is an array, iterations are started in order by index. If `values` is an object, iterations are started in order by the order returned by `Object.keys` (order is not guaranteed).\n\nIf `values` is an array, the results of each iteration will be mapped to an array. If `values` is an object, the results of each iteration will be mapped to an object with corresponding keys.\n\n#### `iterator(value, key, done)`\n\nAn async function called per iteration. All iterations are run in serial.\n\nThe `iterator` function is called once with each `value`, `key` and a function (`done(error, result)`) to call when the async work is complete.\n\nIf `done` is passed an error as the first argument, the iteration will fail and the sequence will be ended without executing any more iterations. If `done` is passed a `result` value as the second argument, it will be added to the final results array or object.\n\n#### `extensions`\n\nThe `extensions` object is used for specifying functions that give insight into the lifecycle of each iteration. The possible extension points are `create`, `before`, `after` and `error`. If an extension point is not specified, it defaults to a no-op function.\n\n##### `extensions.create(value, key)`\n\nCalled at the very beginning of each iteration with the `value` being iterated and the `key` from the array or object. If `create` returns a value (`storage`), it is passed to the `before`, `after` and `error` extension points.\n\nIf a value is not returned, an empty object is used as `storage` for each other extension point.\n\nThis is useful for tracking information across an iteration.\n\n##### `extensions.before(storage)`\n\nCalled immediately before each iteration with the `storage` value returned from the `create` extension point.\n\n##### `extensions.after(result, storage)`\n\nCalled immediately after each iteration with the `result` of the iteration and the `storage` value returned from the `create` extension point.\n\n##### `extensions.error(error, storage)`\n\nCalled immediately after a failed iteration with the `error` of the iteration and the `storage` value returned from the `create` extension point.\n\n#### `callback(error, results)`\n\nA function that is called after all iterations have completed or one iteration has errored.\n\nIf all iterations completed successfully, the `error` argument will be empty and the `results` will be a mapping of the `iterator` results.\n\nIf an iteration errored, the `error` argument will be passed from that iteration and the `results` will be whatever partial results had completed successfully before the error occurred.\n\n## License\n\nMIT\n\n[downloads-image]: http://img.shields.io/npm/dm/now-and-later.svg\n[npm-url]: https://www.npmjs.com/package/now-and-later\n[npm-image]: http://img.shields.io/npm/v/now-and-later.svg\n\n[travis-url]: https://travis-ci.org/gulpjs/now-and-later\n[travis-image]: http://img.shields.io/travis/gulpjs/now-and-later.svg?label=travis-ci\n\n[appveyor-url]: https://ci.appveyor.com/project/gulpjs/now-and-later\n[appveyor-image]: https://img.shields.io/appveyor/ci/gulpjs/now-and-later.svg?label=appveyor\n\n[coveralls-url]: https://coveralls.io/r/gulpjs/now-and-later\n[coveralls-image]: http://img.shields.io/coveralls/gulpjs/now-and-later/master.svg\n\n[gitter-url]: https://gitter.im/gulpjs/gulp\n[gitter-image]: https://badges.gitter.im/gulpjs/gulp.svg" }