为什么函数返回第一个键/值对而不返回其他键/值对？

Question

下面的代码片段是我的脚本，用于存储在单个Array（const存储）中的所有数据，我需要以结构化的方式利用这些数据。为了之后“简单”地使用它们。

console.log(store)在控制台中显示所需的数据结构：

(2) [{…}, {…}]
0: {ID: "freecodecamp", streams: {…}, users: {…}, channels: {…}}
1: {ID: "funfunfunction", channels: {…}, users: {…}, streams: {…}}

console.log(store[0].ID)显示所需的结果："freecodecamp"

但store[0].users，store[0].channels和store[0].streams输出undefined。

我不明白为什么。虽然一切都适用于store[0].ID

const matchCharUrl = str => str.match(/[^/]/g).join('')

// Twitch.tv API call and settings
// --------------------------------------------------
const twitchAPI = () => {
  // const baseUrl = 'https://api.twitch.tv/kraken' // Twitch API base URL

  const baseUrl = 'https://wind-bow.glitch.me/twitch-api/' // FCC Twitch API Pass-through
  const params = ['users/', 'channels/', 'streams/'] // Twitch API, enabled root

  // suffix (channel or user) identifier
  const identifiers = ['freecodecamp', 'funfunfunction']

  // array with datas that will be exploit in a function ( displayResults() )
  const store = []

  identifiers.forEach((ID, index) => {
    const obj = {ID}

    for(const param of params){
      const urlAPI = baseUrl + param + ID

      fetch(urlAPI, {
        method: 'GET'
      }).then(res => {
        if(res.ok) return res.json()
        throw new Error('Network response error. Status Code:', res.status, res.statusText)
      }).then(data => {
        // Data structure of var store:
        // store = [ {id: freecodecamp, channels: {data}, streams: {data}, users: {data} } ]
        obj[matchCharUrl(param)] = data
      }).catch(err => {
        console.log('Fetch Error:', err)
      })
    }
    store.push(obj)
  })
  console.log(store) // OK
  console.log(store[0]) // OK
  console.log(store[0].ID) // OK
  console.log(store[0].users) // undefined
  console.log(store[0].channels) // undefined
  console.log(store[0].streams) // undefined
  // displayResults(store)
}
twitchAPI()