How to use the groupBy function from async

Find comprehensive JavaScript async.groupBy code examples handpicked from public code repositorys.

index.js

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    })
  })
}  
async groupBy(coll, iteratee) {    
  return new Promise(async (resolve, reject) => { 
    async.groupBy(coll, iteratee, (err, res) => {
      if (err) { 
        reject(err)
      } else {
        resolve(res)

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+ 21 other calls in file

jquery.reading-helper.js

GitHub: megumiimai/jquery-kanji-reading-helper

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* @param {Function} [callback] - A callback which is called when all `iteratee`
* functions have finished, or an error occurs. Result is an `Object` whoses
* properties are arrays of values which returned the corresponding key.
* @example
*
* async.groupBy(['userId1', 'userId2', 'userId3'], function(userId, callback) {
*     db.findById(userId, function(err, user) {
*         if (err) return callback(err);
*         return callback(null, user.age);
*     });

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