Async.js

every.js

  1. import createTester from './internal/createTester';
  2. import doParallel from './internal/doParallel';
  3. import notId from './internal/notId';
  5. /**
  6.  * Returns `true` if every element in `coll` satisfies an async test. If any
  7.  * iteratee call returns `false`, the main `callback` is immediately called.
  8.  *
  9.  * @name every
  10.  * @static
  11.  * @memberOf module:Collections
  12.  * @method
  13.  * @alias all
  14.  * @category Collection
  15.  * @param {Array|Iterable|Object} coll - A collection to iterate over.
  16.  * @param {AsyncFunction} iteratee - An async truth test to apply to each item
  17.  * in the collection in parallel.
  18.  * The iteratee must complete with a boolean result value.
  19.  * Invoked with (item, callback).
  20.  * @param {Function} [callback] - A callback which is called after all the
  21.  * `iteratee` functions have finished. Result will be either `true` or `false`
  22.  * depending on the values of the async tests. Invoked with (err, result).
  23.  * @example
  24.  *
  25.  * async.every(['file1','file2','file3'], function(filePath, callback) {
  26.  *     fs.access(filePath, function(err) {
  27.  *         callback(null, !err)
  28.  *     });
  29.  * }, function(err, result) {
  30.  *     // if result is true then every file exists
  31.  * });
  32.  */
  33. export default doParallel(createTester(notId, notId));