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185 lines
5.6 KiB
JavaScript
185 lines
5.6 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 _isArrayLike = require('./internal/isArrayLike.js');
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var _isArrayLike2 = _interopRequireDefault(_isArrayLike);
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var _breakLoop = require('./internal/breakLoop.js');
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var _breakLoop2 = _interopRequireDefault(_breakLoop);
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var _eachOfLimit = require('./eachOfLimit.js');
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var _eachOfLimit2 = _interopRequireDefault(_eachOfLimit);
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var _once = require('./internal/once.js');
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var _once2 = _interopRequireDefault(_once);
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var _onlyOnce = require('./internal/onlyOnce.js');
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var _onlyOnce2 = _interopRequireDefault(_onlyOnce);
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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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// eachOf implementation optimized for array-likes
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function eachOfArrayLike(coll, iteratee, callback) {
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callback = (0, _once2.default)(callback);
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var index = 0,
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completed = 0,
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{ length } = coll,
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canceled = false;
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if (length === 0) {
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callback(null);
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}
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function iteratorCallback(err, value) {
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if (err === false) {
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canceled = true;
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}
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if (canceled === true) return;
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if (err) {
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callback(err);
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} else if (++completed === length || value === _breakLoop2.default) {
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callback(null);
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}
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}
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for (; index < length; index++) {
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iteratee(coll[index], index, (0, _onlyOnce2.default)(iteratorCallback));
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}
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}
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// a generic version of eachOf which can handle array, object, and iterator cases.
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function eachOfGeneric(coll, iteratee, callback) {
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return (0, _eachOfLimit2.default)(coll, Infinity, iteratee, callback);
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}
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/**
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* Like [`each`]{@link module:Collections.each}, except that it passes the key (or index) as the second argument
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* to the iteratee.
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*
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* @name eachOf
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* @static
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* @memberOf module:Collections
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* @method
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* @alias forEachOf
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* @category Collection
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* @see [async.each]{@link module:Collections.each}
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* @param {Array|Iterable|AsyncIterable|Object} coll - A collection to iterate over.
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* @param {AsyncFunction} iteratee - A function to apply to each
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* item in `coll`.
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* The `key` is the item's key, or index in the case of an array.
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* Invoked with (item, key, callback).
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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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* // dev.json is a file containing a valid json object config for dev environment
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* // dev.json is a file containing a valid json object config for test environment
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* // prod.json is a file containing a valid json object config for prod environment
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* // invalid.json is a file with a malformed json object
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*
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* let configs = {}; //global variable
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* let validConfigFileMap = {dev: 'dev.json', test: 'test.json', prod: 'prod.json'};
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* let invalidConfigFileMap = {dev: 'dev.json', test: 'test.json', invalid: 'invalid.json'};
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*
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* // asynchronous function that reads a json file and parses the contents as json object
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* function parseFile(file, key, callback) {
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* fs.readFile(file, "utf8", function(err, data) {
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* if (err) return calback(err);
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* try {
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* configs[key] = JSON.parse(data);
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* } catch (e) {
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* return callback(e);
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* }
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* callback();
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* });
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* }
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*
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* // Using callbacks
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* async.forEachOf(validConfigFileMap, parseFile, function (err) {
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* if (err) {
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* console.error(err);
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* } else {
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* console.log(configs);
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* // configs is now a map of JSON data, e.g.
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* // { dev: //parsed dev.json, test: //parsed test.json, prod: //parsed prod.json}
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* }
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* });
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*
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* //Error handing
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* async.forEachOf(invalidConfigFileMap, parseFile, function (err) {
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* if (err) {
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* console.error(err);
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* // JSON parse error exception
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* } else {
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* console.log(configs);
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* }
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* });
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*
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* // Using Promises
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* async.forEachOf(validConfigFileMap, parseFile)
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* .then( () => {
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* console.log(configs);
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* // configs is now a map of JSON data, e.g.
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* // { dev: //parsed dev.json, test: //parsed test.json, prod: //parsed prod.json}
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* }).catch( err => {
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* console.error(err);
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* });
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*
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* //Error handing
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* async.forEachOf(invalidConfigFileMap, parseFile)
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* .then( () => {
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* console.log(configs);
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* }).catch( err => {
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* console.error(err);
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* // JSON parse error exception
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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.forEachOf(validConfigFileMap, parseFile);
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* console.log(configs);
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* // configs is now a map of JSON data, e.g.
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* // { dev: //parsed dev.json, test: //parsed test.json, prod: //parsed prod.json}
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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 handing
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* async () => {
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* try {
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* let result = await async.forEachOf(invalidConfigFileMap, parseFile);
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* console.log(configs);
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* }
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* catch (err) {
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* console.log(err);
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* // JSON parse error exception
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* }
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* }
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*
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*/
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function eachOf(coll, iteratee, callback) {
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var eachOfImplementation = (0, _isArrayLike2.default)(coll) ? eachOfArrayLike : eachOfGeneric;
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return eachOfImplementation(coll, (0, _wrapAsync2.default)(iteratee), callback);
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}
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exports.default = (0, _awaitify2.default)(eachOf, 3);
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module.exports = exports['default']; |