119 lines
3.5 KiB
JavaScript
119 lines
3.5 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 _createTester = require('./internal/createTester.js');
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var _createTester2 = _interopRequireDefault(_createTester);
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var _eachOf = require('./eachOf.js');
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var _eachOf2 = _interopRequireDefault(_eachOf);
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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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* Returns `true` if every element in `coll` satisfies an async test. If any
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* iteratee call returns `false`, the main `callback` is immediately called.
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*
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* @name every
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* @static
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* @memberOf module:Collections
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* @method
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* @alias all
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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 truth test to apply to each item
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* in the collection in parallel.
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* The iteratee must complete with a boolean result value.
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* Invoked with (item, callback).
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* @param {Function} [callback] - A callback which is called after all the
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* `iteratee` functions have finished. Result will be either `true` or `false`
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* depending on the values of the async tests. Invoked with (err, result).
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* @returns {Promise} a promise, if no callback provided
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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/file1.txt','dir2/file3.txt','dir3/file5.txt'];
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* const withMissingFileList = ['file1.txt','file2.txt','file4.txt'];
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*
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* // asynchronous function that checks if a file exists
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* function fileExists(file, callback) {
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* fs.access(file, fs.constants.F_OK, (err) => {
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* callback(null, !err);
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* });
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* }
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*
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* // Using callbacks
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* async.every(fileList, fileExists, function(err, result) {
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* console.log(result);
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* // true
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* // result is true since every file exists
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* });
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*
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* async.every(withMissingFileList, fileExists, function(err, result) {
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* console.log(result);
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* // false
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* // result is false since NOT every file exists
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* });
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*
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* // Using Promises
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* async.every(fileList, fileExists)
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* .then( result => {
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* console.log(result);
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* // true
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* // result is true since every file exists
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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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* async.every(withMissingFileList, fileExists)
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* .then( result => {
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* console.log(result);
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* // false
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* // result is false since NOT every file exists
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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.every(fileList, fileExists);
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* console.log(result);
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* // true
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* // result is true since every file exists
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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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* async () => {
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* try {
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* let result = await async.every(withMissingFileList, fileExists);
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* console.log(result);
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* // false
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* // result is false since NOT every file exists
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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 every(coll, iteratee, callback) {
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return (0, _createTester2.default)(bool => !bool, res => !res)(_eachOf2.default, coll, iteratee, callback);
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}
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exports.default = (0, _awaitify2.default)(every, 3);
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module.exports = exports.default; |