从 JSON NodeJS 中的嵌套数组中提取第一个元素

Question

I'm trying to grab the nested array called platforms, but i only want the first key in there. So for the Array it should be like [{platforms: [windows], [windows]]} instead of [{platforms: [windows, osx, linux, null], [windows, null, null, null]]} Is this even achievable? I looked through .map and .filter but can't seem to just grab the first piece of the array.

Example ARRAY

[{ id: 1,
game: { position: 1},
platforms: [ 'windows', 'osx', 'linux', null ],
title: 'xxx',
user: {
  url: 'xxxx',
  name: 'xxx',
  id: 1
}
},{ id: 2,
game: { position: 2},
platforms: [ 'windows', null, null, null, ],
title: 'xxx',
user: {
  url: 'xxxx',
  name: 'xxx',
  id: 2
}
]

How can I handle this in Javascript / NodeJS

var result = body.games.filter(a=>a).reduce((acc, a) => {
    return acc.concat(a)
}, []).map(a=>a.platforms);
console.log(result);

Result = [ 'windows', 'osx', 'linux' null ], [ 'windows', null, null, null ],

Answer 1

A simple .map should do this:

 function mapPlatform(data) { return data.map(entry => Array.isArray(entry.platforms)? entry.platforms[0]: 'no platform data available') } const data = [{id:1,game:{position:1},platforms:['windows','osx','linux',null],title:'xxx',user:{url:'xxxx',name:'xxx',id:1,},},{id:2,game:{position:2},platforms:['windows',null,null,null],title:'xxx',user:{url:'xxxx',name:'xxx',id:2,},}]; console.log(mapPlatform(data));