Bug in solution of this task: https://javascript.info/array-methods#create-keyed-object-from-array

There's a bug in the solution posted in this task.
The task requires us to group objects by id and put the grouped objects in an array keyed by id.
The solution posted is:

function groupById(array) {
  return array.reduce((obj, value) => {
    obj[value.id] = value;
    return obj;
  }, {})
}

However, this does not work when there are items in array with same id.
To accomplish the task correctly, the solution should be:

function groupById(array) {
  return array.reduce((obj, value) => {
    obj[value.id] == undefined ? obj[value.id] = [value] : obj[value.id].push(value);
    return obj;
  }, {})
}

開啟 javascript.info/array-methods#create-keyed-object-from-array 中的陣列方法任務，並將其中提出的分組要求與發布的 reduce 解決方案進行比較。更新文件中的解決方案，使重複的 ID 保留所有分組物件，然後驗證範例和說明仍與修正後的結果一致。