Lodash将对象数组转换为数组

Question

我有这样的对象数组:

[ { season: 1,
    episodes:
     [ 
       {
        title:'ep1 title',
        season:1,
       },
       {
        title:'ep2 title',
        season:1,
       },
       {
        title:'ep3 title',
        season:1,
       }] },
  { season: 2,
    episodes:
     [ {
        title:'ep1 title',
        season:2,
       },
       {
        title:'ep2 title',
        season:2,
       },
       {
        title:'ep3 title',
        season:2,
       } ] },
  { season: 3,
    episodes:
     [ {
        title:'ep1 title',
        season:3,
       },
       {
        title:'ep2 title',
        season:3,
       },
       {
        title:'ep3 title',
        season:3,
       } ] },
]

我想用loadsh把它变成这样的数组:

[
  {
    title:'ep1 title',
    season:1,
  },
  {
    title:'ep2 title',
    season:1,
  },
  {
    title:'ep3 title',
    season:1,
  },
  {
    title:'ep1 title',
    season:2,
  },
  {
    title:'ep2 title',
    season:2,
  },
  {
    title:'ep3 title',
    season:2,
  },
  {
    title:'ep1 title',
    season:3,
  },
  {
    title:'ep2 title',
    season:3,
  },
  {
    title:'ep3 title',
    season:3,
  }
]

我只想用lodash将episodes转换对象转换为数组如何使用lodash lodash将两个数组合并到一个对象中:从对象数组中计算值

Answer 1

您可以在以下位置使用纯JavaScript data:

var flat = [].concat(...data.map( o => o.episodes ));

var data = [ { season: 1,
    episodes:
     [ 
       {
        title:'ep1 title',
        season:1,
       },
       {
        title:'ep2 title',
        season:1,
       },
       {
        title:'ep3 title',
        season:1,
       }] },
  { season: 2,
    episodes:
     [ {
        title:'ep1 title',
        season:2,
       },
       {
        title:'ep2 title',
        season:2,
       },
       {
        title:'ep3 title',
        season:2,
       } ] },
  { season: 3,
    episodes:
     [ {
        title:'ep1 title',
        season:3,
       },
       {
        title:'ep2 title',
        season:3,
       },
       {
        title:'ep3 title',
        season:3,
       } ] },
];

var flat = [].concat(...data.map( o => o.episodes ));
console.log(flat);

.as-console-wrapper { max-height: 100% !important; top: 0; }

如果它真的必须是lodash,你可以使用_.flatMap:

var flat = _.flatMap(data, 'episodes');

var data = [ { season: 1,
    episodes:
     [ 
       {
        title:'ep1 title',
        season:1,
       },
       {
        title:'ep2 title',
        season:1,
       },
       {
        title:'ep3 title',
        season:1,
       }] },
  { season: 2,
    episodes:
     [ {
        title:'ep1 title',
        season:2,
       },
       {
        title:'ep2 title',
        season:2,
       },
       {
        title:'ep3 title',
        season:2,
       } ] },
  { season: 3,
    episodes:
     [ {
        title:'ep1 title',
        season:3,
       },
       {
        title:'ep2 title',
        season:3,
       },
       {
        title:'ep3 title',
        season:3,
       } ] },
];

var flat = _.flatMap(data, 'episodes');

console.log(flat);

.as-console-wrapper { max-height: 100% !important; top: 0; }

<script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.4/lodash.min.js"></script>