82 lines
2.8 KiB
JavaScript
82 lines
2.8 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 = eachLimit;
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var _eachOf = require('./eachOf');
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var _eachOf2 = _interopRequireDefault(_eachOf);
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var _withoutIndex = require('./internal/withoutIndex');
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var _withoutIndex2 = _interopRequireDefault(_withoutIndex);
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var _wrapAsync = require('./internal/wrapAsync');
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var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
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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|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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* @example
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*
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* // assuming openFiles is an array of file names and saveFile is a function
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* // to save the modified contents of that file:
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*
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* async.each(openFiles, saveFile, function(err){
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* // if any of the saves produced an error, err would equal that error
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* });
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*
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* // assuming openFiles is an array of file names
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* async.each(openFiles, function(file, callback) {
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*
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* // Perform operation on file here.
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* console.log('Processing file ' + file);
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*
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* if( file.length > 32 ) {
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* console.log('This file name is too long');
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* callback('File name too long');
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* } else {
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* // Do work to process file here
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* console.log('File processed');
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* callback();
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* }
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* }, function(err) {
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* // if any of the file processing produced an error, err would equal that error
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* if( err ) {
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* // One of the iterations produced an error.
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* // All processing will now stop.
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* console.log('A file failed to process');
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* } else {
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* console.log('All files have been processed successfully');
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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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(0, _eachOf2.default)(coll, (0, _withoutIndex2.default)((0, _wrapAsync2.default)(iteratee)), callback);
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}
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module.exports = exports['default'];
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