如何过滤属于数组值的对象？

问题描述：

[ 
    { 
    "date": "2017-10-04", 
    "games": [ 
     { 
     "notes": "Game was played", 
     "time": "2017-10-04T20:24:30+00:00", 
     "sport": "hockey", 
     "owner": "steve", 
     "players": "10", 
     "game_id": 1 
     }, 
     { 
     "notes": "Game was played", 
     "time": "2017-10-04T12:35:30+00:00", 
     "sport": "lacrosse", 
     "owner": "steve", 
     "players": "6", 
     "game_id": 2 
     }, 
     { 
     "notes": "Game was played", 
     "time": "2017-10-04T10:12:30+00:00", 
     "sport": "hockey", 
     "owner": "henry", 
     "players": "10", 
     "game_id": 4 
     } 
    ] 
    }, 
    { 
    "date": "2017-10-14", 
    "games": [ 
     { 
     "notes": "Game was played", 
     "time": "2017-10-14T20:32:30+00:00", 
     "sport": "hockey", 
     "owner": "steve", 
     "players": "4", 
     "game_id": 3 
     }, 
     { 
     "notes": "Game was played", 
     "time": "2017-10-14T20:34:30+00:00", 
     "sport": "soccer", 
     "owner": "john", 
     "players": "12", 
     "game_id": 5 
     } 
    ] 
    } 
]

我怎么过滤掉的对象，这样我只显示曲棍球比赛于该日播放。本质上我需要相同的对象数组，但只有当游戏键= sport: hockey

只显示对象我知道我只能在数组上运行过滤器方法，但我无法弄清楚如何循环数组内部的对象并再次返回整个对象。任何帮助将不胜感激。

这可能有助于太https://stackoverflow.com/questions/38375646/filtering-array-of-objects-with-arrays-based-嵌套值 –

答

尝试：

const filtered = yourArray.map(item => ({...item, games: item.games.filter(game => game.sport === 'hockey')}) 

// When run, this produces: 
[ 
    { 
     "date": "2017-10-04", 
     "games": [ 
      { 
       "game_id": 1, 
       "notes": "Game was played", 
       "owner": "steve", 
       "players": "10", 
       "sport": "hockey", 
       "time": "2017-10-04T20:24:30+00:00" 
      }, 
      { 
       "game_id": 4, 
       "notes": "Game was played", 
       "owner": "henry", 
       "players": "10", 
       "sport": "hockey", 
       "time": "2017-10-04T10:12:30+00:00" 
      } 
     ] 
    }, 
    { 
     "date": "2017-10-14", 
     "games": [ 
      { 
       "game_id": 3, 
       "notes": "Game was played", 
       "owner": "steve", 
       "players": "4", 
       "sport": "hockey", 
       "time": "2017-10-14T20:32:30+00:00" 
      } 
     ] 
    } 
]

我认为这是你想要的。

您好CRice，感谢您花时间回答我，但这似乎并没有工作......我试图找出基本上如何取回日期和所有游戏相同的阵列，但这些比赛应该只显示他们是否=曲棍球。 – Blake

我已经更新了我的答案，并在过滤器完成后提供了最终对象。仔细查看一下，如果这就是你想要的，很好，但是否则让我知道你期望找回哪些数据，并且我可以修改它以产生它。 – CRice

您好CRice，我使用扩展运算符时一直ketting错误，所以我用date：item.date，似乎工作。我遇到的唯一问题是，这也是没有任何曲棍球比赛（比赛阵列是空的）的返回对象，但由于当天除了曲棍球之外还有其他比赛，所以我回来的日期只与游戏数组为空......这是导致我渲染空的组件......只是想知道是否有解决方法？我的实际数据比我上面给出的样本大很多，所以有些日期没有曲棍球比赛。 – Blake

答

我认为下面的代码应该做的伎俩：

var x=[ 
{ 
"date": "2017-10-04", 
"games": [ 
    { 
    "notes": "Game was played", 
    "time": "2017-10-04T20:24:30+00:00", 
    "sport": "hockey", 
    "owner": "steve", 
    "players": "10", 
    "game_id": 1 
    }, 
    { 
    "notes": "Game was played", 
    "time": "2017-10-04T12:35:30+00:00", 
    "sport": "lacrosse", 
    "owner": "steve", 
    "players": "6", 
    "game_id": 2 
    }, 
    { 
    "notes": "Game was played", 
    "time": "2017-10-04T10:12:30+00:00", 
    "sport": "hockey", 
    "owner": "henry", 
    "players": "10", 
    "game_id": 4 
    } 
] 
}, 
{ 
"date": "2017-10-14", 
"games": [ 
    { 
    "notes": "Game was played", 
    "time": "2017-10-14T20:32:30+00:00", 
    "sport": "hockey", 
    "owner": "steve", 
    "players": "4", 
    "game_id": 3 
    }, 
    { 
    "notes": "Game was played", 
    "time": "2017-10-14T20:34:30+00:00", 
    "sport": "soccer", 
    "owner": "john", 
    "players": "12", 
    "game_id": 5 
    } 
] 
}] 


function filterByDate (data, date){ 

    return data.filter(function(entry){ 
    return sameDay(new Date(entry.date), date) 

    }) 
} 

function filterBySport(data, sport){ 
    data.forEach(function(entry){ 
    entry.games=entry.games.filter(function(entry2){ 
     return entry2.sport===sport 
    }) 
    }) 
    return data 
} 

function sameDay(date1, date2){ //helper function to check for date equality 
    return date1.getFullYear()===date2.getFullYear() && 
      date1.getMonth()===date2.getMonth() && 
     date1.getDay()===date2.getDay() 
} 

function myFilter(data, date, sportType){ // the final function you have to call 
    return filterBySport(filterByDate(data, date), sportType) 
} 

console.log(myFilter(x, new Date("2017-10-04"), "hockey"))

如何过滤属于数组值的对象？

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