合并/展平多维数组并删除重复的Javascript



我有一个多维数组,如下所示:

var workouts = [
  [0, Object, 0, 0, 0],
  [Object, 0, 0, 0, 0],
  [0, 0, 0, Object, 0]
];

我想展平/合并数组并删除重复项。结果应该是这样的:

[Object, Object, 0, Object, 0]

有可能表演吗?

我的理解是,如果第一个遇到的对象存在,则希望将其保留在给定的列中。

您可以使用.map().reduce():

var workouts = [
  [0, {id:1}, 0, 0, 0],
  [{id:2}, 0, 0, 0, 0],
  [0, 0, 0, {id:3}, 0]
];
var res = workouts.reduce(function(a, b) {
  return b.map(function(e, i) { return a[i] instanceof Object ? a[i] : e; });
}, []);
console.log(JSON.stringify(res));

派对迟到了,但我仍然想利用:

  • CCD_ 3用于将尺寸减小到1
  • 用于删除重复数据的Set
  • Spread Syntax用于从该集合中获取数组
  • CCD_ 6和解析返回以处理对象的重复

以下是代码和一个非常鼓舞人心的帖子1和2:

const myArray = [
  [0, {id:1}, 0, 0, 0],
  [{id:2}, 0, 0, 0, 0],
  [0, 0, 0, {id:2}, 0]
]
const myFlatArray = myArray.flat()
const result = [...new Set(myFlatArray.map(JSON.stringify))].map(JSON.parse)
console.log(JSON.stringify(result))

注意:此解决方案必须支持ES6

var workouts = [
  [0, {id:1}, 0, 0, 0],
  [{id:2}, 0, 0, 0, 0],
  [0, 0, 0, {id:3}, 0]
];
function flattenArray (array){
  var newArray = [];
  for (i=0; i<array.length; i++){
    var subArray = array[i];
    for (ii=0; ii<subArray.length; ii++){
      if (newArray.indexOf(subArray[ii]) == -1){
      newArray.push(subArray[ii]);
      }
    }
  }
  return newArray;
}
console.log(flattenArray(workouts));

http://codepen.io/anon/pen/WxLrqL

我愿意这样做;

var workouts = [[0, {a:1}, 0, 0, 0],
                [{b:2}, 0, 0, 0, 0],
                [0, 0, 0, {c:3}, 0]
               ],
      result = workouts.reduce((p,c) => p = c.map((e,i) => e || p[i] || 0 ),[])
console.log(result);

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