將一組選民對象轉換為投票人數的計數 請幫助我我開始學習 javascript 但我對減少和過濾某些人可以解決的問題感到困惑？我運行代碼和未定義的@@``    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}];``