Question

我需要有一个地图，其中包含键和相应的值作为数组，我该怎么做？

[
{
"language": "english",    
"movie_name": "die-hard",
"movie_size": 89
},{
"language": "english",
"movie_name": "inception",
"movie_size": 40
},{
"language": "english",
"movie_name": "Lionking",
"movie_size": 50
},{
"language": "spanish",
"movie_name": "L'amour",
"movie_size": 10
},
{
"language": "spanish",
"movie_name": "L'amour",
"movie_size": 65
},{
"language": "english",
"movie_name": "inception",
"movie_size": 70
},{
"language": "english",
"movie_name": "die-hard",
"movie_size": 62
}
]

以上是我的数据结构，下面我的代码我可以形成一张地图，用于打印每种语言的电影数量。

我有一个代码fiddle，目前将以下内容打印到控制台

 Map{
'english' => Map {'die-hard' => 2, 'inception' => 2, 'Lionking' => 1},
'spanish' => Map {'L'amour' => 2} }

但是我想根据电影大小计算百分位数，为此我需要基于语言的特定movie_name的所有movie_size。我不确定如何实现这一目标。

Answer 1

将值设置为数组[]和.push以向其添加项目：

array = [ { "language": "english", "movie_name": "die-hard-4k"   , "movie_size": 89 }, 
          { "language": "english", "movie_name": "inception-1080", "movie_size": 40 },
          { "language": "english", "movie_name": "Lionking-4k"   , "movie_size": 50 },
          { "language": "spanish", "movie_name": "L'amour-1080"  , "movie_size": 10 },
          { "language": "spanish", "movie_name": "L'amour-4k"    , "movie_size": 65 },
          { "language": "english", "movie_name": "inception-4k"  , "movie_size": 70 },
          { "language": "english", "movie_name": "die-hard-1080" , "movie_size": 62 } ]

result = {}
for (item of array) {
  language = result[item.language] || (result[item.language] = {})
  movie_name = item.movie_name.replace(/-[^-]*$/, '')
  movie_size = language[movie_name] || (language[movie_name] = [])
  movie_size.push(item.movie_size)
}

console.log(result)

如何在Javascript Map中将数值作为数组？

1 个答案: