Javascript array.filter和reduce

将选民对象数组转换为投票人数的计数 请帮助我开始学习javascript，但我对reduce和filter很困惑，有人能解决吗？我运行代码，但未定义@@``

    function total(arr) {
    let result = arr.filter(function(votes){
   return votes !==true;
 }).reduce(function(item,cur){
   return [(+item),+(+cur)];
 },[0]);}
var voters = [
  {name:'Bob' , age: 30, voted: true},
  {name:'Jake' , age: 32, voted: true},
  {name:'Kate' , age: 25, voted: false},
  {name:'Sam' , age: 20, voted: false},
  {name:'Phil' , age: 21, voted: true},
  {name:'Ed' , age:55, voted:true},
  {name:'Tami' , age: 54, voted:true},
  {name:'Mary', age: 31, voted: false},
  {name:'Becky', age: 43, voted: false},
  {name:'Joey', age: 41, voted: true},
  {name:'Jeff', age: 30, voted: true},
  {name:'Zack', age: 19, voted: false}
];``

---

您可以使用单个reduce并将对象的布尔值简单地添加到计数中

函数总数（数组）{
返回数组.reduce（函数（计数、表决器）{
返回计数+选民投票数；
}, 0);
}
var选民=[{姓名：'Bob'，年龄：30，投票：true}，{姓名：'Jake'，年龄：32，投票：true}，{姓名：'Kate'，年龄：25，投票：false}，{姓名：'Sam'，年龄：20，投票：false}，{姓名：'Phil'，年龄：21，投票：true}，{姓名：'Ed年龄：55，投票：true}，{姓名：'Tami'，年龄：54，投票：true}，{姓名：'Mary'，年龄：31，投票：false}，{姓名：'Becky'，年龄：43，投票：false}，{姓名：'Joey'，年龄：41，投票：true}，{姓名：'Jeff'，年龄：30，投票：true}，{姓名：'Zack'，年龄：19，投票：false}；
log（总数（投票者））；

最好也是最短的方法就是过滤和计数

let voters = [
  {name:'Bob' , age: 30, voted: true},
  {name:'Jake' , age: 32, voted: true},
  {name:'Kate' , age: 25, voted: false},
  {name:'Sam' , age: 20, voted: false},
  {name:'Phil' , age: 21, voted: true},
  {name:'Ed' , age:55, voted:true},
  {name:'Tami' , age: 54, voted:true},
  {name:'Mary', age: 31, voted: false},
  {name:'Becky', age: 43, voted: false},
  {name:'Joey', age: 41, voted: true},
  {name:'Jeff', age: 30, voted: true},
  {name:'Zack', age: 19, voted: false}
];

voters.filter(person => person.voted).length

---

投票者。筛选（x=>x.voted）。长度

谢谢大家，我刚刚做了：D