129 lines
3.9 KiB
JavaScript
129 lines
3.9 KiB
JavaScript
'use strict';
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Object.defineProperty(exports, "__esModule", {
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value: true
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});
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var _eachOf = require('./eachOf.js');
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var _eachOf2 = _interopRequireDefault(_eachOf);
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var _withoutIndex = require('./internal/withoutIndex.js');
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var _withoutIndex2 = _interopRequireDefault(_withoutIndex);
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var _wrapAsync = require('./internal/wrapAsync.js');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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var _awaitify = require('./internal/awaitify.js');
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var _awaitify2 = _interopRequireDefault(_awaitify);
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function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
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/**
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* Applies the function `iteratee` to each item in `coll`, in parallel.
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* The `iteratee` is called with an item from the list, and a callback for when
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* it has finished. If the `iteratee` passes an error to its `callback`, the
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* main `callback` (for the `each` function) is immediately called with the
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* error.
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*
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* Note, that since this function applies `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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*
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* @name each
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* @static
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* @memberOf module:Collections
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* @method
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* @alias forEach
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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
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* each item in `coll`. Invoked with (item, callback).
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* The array index is not passed to the iteratee.
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* If you need the index, use `eachOf`.
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* @param {Function} [callback] - A callback which is called when all
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* `iteratee` functions have finished, or an error occurs. Invoked with (err).
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* @returns {Promise} a promise, if a callback is omitted
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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 fileList = [ 'dir1/file2.txt', 'dir2/file3.txt', 'dir/file5.txt'];
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* const withMissingFileList = ['dir1/file1.txt', 'dir4/file2.txt'];
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*
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* // asynchronous function that deletes a file
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* const deleteFile = function(file, callback) {
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* fs.unlink(file, callback);
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* };
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*
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* // Using callbacks
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* async.each(fileList, deleteFile, function(err) {
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* if( err ) {
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* console.log(err);
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* } else {
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* console.log('All files have been deleted successfully');
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* }
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* });
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*
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* // Error Handling
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* async.each(withMissingFileList, deleteFile, function(err){
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* console.log(err);
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* // [ Error: ENOENT: no such file or directory ]
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* // since dir4/file2.txt does not exist
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* // dir1/file1.txt could have been deleted
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* });
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*
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* // Using Promises
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* async.each(fileList, deleteFile)
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* .then( () => {
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* console.log('All files have been deleted successfully');
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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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* // Error Handling
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* async.each(fileList, deleteFile)
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* .then( () => {
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* console.log('All files have been deleted successfully');
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* }).catch( err => {
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* console.log(err);
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* // [ Error: ENOENT: no such file or directory ]
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* // since dir4/file2.txt does not exist
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* // dir1/file1.txt could have been deleted
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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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* await async.each(files, deleteFile);
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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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* // Error Handling
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* async () => {
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* try {
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* await async.each(withMissingFileList, deleteFile);
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* }
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* catch (err) {
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* console.log(err);
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* // [ Error: ENOENT: no such file or directory ]
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* // since dir4/file2.txt does not exist
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* // dir1/file1.txt could have been deleted
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* }
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* }
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*
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*/
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function eachLimit(coll, iteratee, callback) {
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return (0, _eachOf2.default)(coll, (0, _withoutIndex2.default)((0, _wrapAsync2.default)(iteratee)), callback);
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}
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exports.default = (0, _awaitify2.default)(eachLimit, 3);
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module.exports = exports['default']; |