108 lines
3.5 KiB
JavaScript
108 lines
3.5 KiB
JavaScript
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'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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exports.default = groupBy;
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var _groupByLimit = require('./groupByLimit.js');
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var _groupByLimit2 = _interopRequireDefault(_groupByLimit);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Returns a new object, where each value corresponds to an array of items, from
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* `coll`, that returned the corresponding key. That is, the keys of the object
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* correspond to the values passed to the `iteratee` callback.
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*
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* Note: Since this function applies the `iteratee` to each item in parallel,
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* there is no guarantee that the `iteratee` functions will complete in order.
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* However, the values for each key in the `result` will be in the same order as
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* the original `coll`. For Objects, the values will roughly be in the order of
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* the original Objects' keys (but this can vary across JavaScript engines).
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*
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* @name groupBy
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* @static
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* @memberOf module:Collections
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* @method
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* @category Collection
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* @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
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* @param {AsyncFunction} iteratee - An async function to apply to each item in
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* `coll`.
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* The iteratee should complete with a `key` to group the value under.
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* Invoked with (value, callback).
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* @param {Function} [callback] - A callback which is called when all `iteratee`
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* functions have finished, or an error occurs. Result is an `Object` whoses
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* properties are arrays of values which returned the corresponding key.
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* @returns {Promise} a promise, if no callback is passed
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* @example
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*
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* // dir1 is a directory that contains file1.txt, file2.txt
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* // dir2 is a directory that contains file3.txt, file4.txt
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* // dir3 is a directory that contains file5.txt
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* // dir4 does not exist
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*
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* const files = ['dir1/file1.txt','dir2','dir4']
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*
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* // asynchronous function that detects file type as none, file, or directory
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* function detectFile(file, callback) {
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* fs.stat(file, function(err, stat) {
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* if (err) {
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* return callback(null, 'none');
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* }
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* callback(null, stat.isDirectory() ? 'directory' : 'file');
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* });
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* }
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*
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* //Using callbacks
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* async.groupBy(files, detectFile, function(err, result) {
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* if(err) {
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* console.log(err);
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* } else {
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* console.log(result);
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* // {
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* // file: [ 'dir1/file1.txt' ],
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* // none: [ 'dir4' ],
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* // directory: [ 'dir2']
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* // }
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* // result is object containing the files grouped by type
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* }
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* });
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*
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* // Using Promises
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* async.groupBy(files, detectFile)
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* .then( result => {
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* console.log(result);
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* // {
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* // file: [ 'dir1/file1.txt' ],
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* // none: [ 'dir4' ],
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* // directory: [ 'dir2']
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* // }
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* // result is object containing the files grouped by type
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* }).catch( err => {
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* console.log(err);
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* });
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*
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* // Using async/await
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* async () => {
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* try {
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* let result = await async.groupBy(files, detectFile);
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* console.log(result);
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* // {
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* // file: [ 'dir1/file1.txt' ],
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* // none: [ 'dir4' ],
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* // directory: [ 'dir2']
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* // }
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* // result is object containing the files grouped by type
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* }
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* catch (err) {
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* console.log(err);
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* }
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* }
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*
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*/
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function groupBy(coll, iteratee, callback) {
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return (0, _groupByLimit2.default)(coll, Infinity, iteratee, callback);
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}
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module.exports = exports['default'];
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