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'use strict'; Object.defineProperty(exports, "__esModule", { value: true }); var _map2 = require('./internal/map.js'); var _map3 = _interopRequireDefault(_map2); var _eachOf = require('./eachOf.js'); var _eachOf2 = _interopRequireDefault(_eachOf); var _awaitify = require('./internal/awaitify.js'); var _awaitify2 = _interopRequireDefault(_awaitify); function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; } /** * Produces a new collection of values by mapping each value in `coll` through * the `iteratee` function. The `iteratee` is called with an item from `coll` * and a callback for when it has finished processing. Each of these callbacks * takes 2 arguments: an `error`, and the transformed item from `coll`. If * `iteratee` passes an error to its callback, the main `callback` (for the * `map` function) is immediately called with the error. * * Note, that since this function applies the `iteratee` to each item in * parallel, there is no guarantee that the `iteratee` functions will complete * in order. However, the results array will be in the same order as the * original `coll`. * * If `map` is passed an Object, the results will be an Array. The results * will roughly be in the order of the original Objects' keys (but this can * vary across JavaScript engines). * * @name map * @static * @memberOf module:Collections * @method * @category Collection * @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over. * @param {AsyncFunction} iteratee - An async function to apply to each item in * `coll`. * The iteratee should complete with the transformed item. * Invoked with (item, callback). * @param {Function} [callback] - A callback which is called when all `iteratee` * functions have finished, or an error occurs. Results is an Array of the * transformed items from the `coll`. Invoked with (err, results). * @returns {Promise} a promise, if no callback is passed * @example * * // file1.txt is a file that is 1000 bytes in size * // file2.txt is a file that is 2000 bytes in size * // file3.txt is a file that is 3000 bytes in size * // file4.txt does not exist * * const fileList = ['file1.txt','file2.txt','file3.txt']; * const withMissingFileList = ['file1.txt','file2.txt','file4.txt']; * * // asynchronous function that returns the file size in bytes * function getFileSizeInBytes(file, callback) { * fs.stat(file, function(err, stat) { * if (err) { * return callback(err); * } * callback(null, stat.size); * }); * } * * // Using callbacks * async.map(fileList, getFileSizeInBytes, function(err, results) { * if (err) { * console.log(err); * } else { * console.log(results); * // results is now an array of the file size in bytes for each file, e.g. * // [ 1000, 2000, 3000] * } * }); * * // Error Handling * async.map(withMissingFileList, getFileSizeInBytes, function(err, results) { * if (err) { * console.log(err); * // [ Error: ENOENT: no such file or directory ] * } else { * console.log(results); * } * }); * * // Using Promises * async.map(fileList, getFileSizeInBytes) * .then( results => { * console.log(results); * // results is now an array of the file size in bytes for each file, e.g. * // [ 1000, 2000, 3000] * }).catch( err => { * console.log(err); * }); * * // Error Handling * async.map(withMissingFileList, getFileSizeInBytes) * .then( results => { * console.log(results); * }).catch( err => { * console.log(err); * // [ Error: ENOENT: no such file or directory ] * }); * * // Using async/await * async () => { * try { * let results = await async.map(fileList, getFileSizeInBytes); * console.log(results); * // results is now an array of the file size in bytes for each file, e.g. * // [ 1000, 2000, 3000] * } * catch (err) { * console.log(err); * } * } * * // Error Handling * async () => { * try { * let results = await async.map(withMissingFileList, getFileSizeInBytes); * console.log(results); * } * catch (err) { * console.log(err); * // [ Error: ENOENT: no such file or directory ] * } * } * */ function map(coll, iteratee, callback) { return (0, _map3.default)(_eachOf2.default, coll, iteratee, callback); } exports.default = (0, _awaitify2.default)(map, 3); module.exports = exports['default'];