数组数组中的对象数组分组-JS [关闭]

Question

我正在尝试通过对象中的 'group' 键对数组数组中的对象数组进行分组。

当前数组：

array =
[
    [{name:’a’,age:’4’,group:’15’},{name:’b’,age:’4’,group:’15’}, 
     {name:’c’,age:’4’,group:’15’}],
    [{name:’aa’,age:’6’,group:’12’},{name:’bb’,age:’6’,group:’12’}],
    [{name:’d’,age:’5’,group:’15’},{name:’e’,age:’5’,group:’15’}, 
     {name:’f’,age:’5’,group:’15’}],
    [{name:’dd’,age:’7’,group:’12’}, 
     {name:’ee’,age:’7’,group:’12’{name:’ff’,age:’7’,group:’12’}]
]

我想得到一个如下所示的数组：

newArray=  [
        {15:[[{name:’a’,age:’4’,group:’15’},{name:’b’,age:’4’,group:’15’}, 
              {name:’c’,age:’4’,group:’15’}],[{name:’d’,age:’5’,group:’15’}, 
              {name:’e’,age:’5’,group:’15’},{name:’f’,age:’5’,group:’15’}]
        },
        {12:[[{name:’aa’,age:’6’,group:’12’},{name:’bb’,age:’6’,group:’12’}],
            [{name:’dd’,age:’7’,group:’12’},{name:’ee’,age:’7’,group:’12’}, 
             {name:’ff’,age:’7’,group:’12’}]]
        }
    ]

谢谢！

Answer 1

flat 以展平阵列。
创建对象映射以按组和年龄分组。
提取对象映射中每个键的单个对象，并将年龄对象解包为数组。
年龄是数字，ES2015对整数索引进行排序，所以顺序已经按年龄排序了。

注意：由于使用了非标准的单引号，您的 JavaScript 数据对象是无效的 JavaScript。并且您的数据中有未闭合的括号。解析为净化为 JSON 的字符串。

res = 
Object.entries(
array.flat().reduce((res,x)=>{
  const {age, group} = x
  res[group] = res[group] || {}
  res[group][age] = res[group][age] || []
  res[group][age].push(x)
  return res
},{})
).map(([k,v])=>({[k]: Object.values(v)}))

console.log(res)

<script>
array =
JSON.parse(`[
    [{name:’a’,age:’4’,group:’15’},{name:’b’,age:’4’,group:’15’}, 
     {name:’c’,age:’4’,group:’15’}],
    [{name:’aa’,age:’6’,group:’12’},{name:’bb’,age:’6’,group:’12’}],
    [{name:’d’,age:’5’,group:’15’},{name:’e’,age:’5’,group:’15’}, 
     {name:’f’,age:’5’,group:’15’}],
    [{name:’dd’,age:’7’,group:’12’}, 
     {name:’ee’,age:’7’,group:’12’},{name:’ff’,age:’7’,group:’12’}]
]`.replace(/’/g,'"').replace(/(name|age|group)/g,'"$1"'))
</script>

Answer 2

你可以用Reduce做这样的事情：

array =
[
    [{name:'a',age:'4',group:'15'},
     {name:'b',age:'9',group:'15'}, 
     {name:'c',age:'6',group:'15'},
     {name:'c',age:'8',group:'15'},
     {name:'c',age:'4',group:'15'}],
    [{name:'aa',age:'6',group:'12'}]
];
const groupByAge = (acc, elem)=>{
    acc[elem.age] = acc[elem.age]?  [...acc[elem.age],elem] : [elem];
    return acc
}
var res = array.reduce((acc, elem)=>{
var key = "";
  elem.forEach(k=> {
       key  = k.group;
       acc[k.group] = acc[k.group] ?  [...acc[k.group], k] : [k];
   });
  var temp= acc[key].reduce(groupByAge, {});
  acc[key] = Object.values(temp);
  return acc
},{});

console.log([res])