JavaScript-找出数组中相同的数据，并合并相同数据中的

let arry = [
  {id: 1, list: [ {name:'张三'} ] },
  {id: 1, list: [{name:'李四' }, {name:'王五'}]},
  {id: 2, list: [ {name:'李白'} ]} 
]

function dataFilter(data){
    var obj = {}, arr = [];
    for(var i = 0, len = data.length; i < len ; i++){
      var currentData = data[i],
          currentKey = currentData.id,
          hased = currentKey in obj;   
      obj[currentKey] = {
          id : currentData.id,
          list :  (hased ? obj[currentKey]['list'] : []).concat(currentData.list)
      }   
    }
    for(var key in obj){
      arr.push(obj[key]);
    }
    return arr;
  }

  console.log(dataFilter(arry))

[
  {id: 1, list: [ {name:'张三'}, {name:'李四' }, {name:'王五'} ] },
  {id: 2, list: [ {name:'李白'} ] } 
]