自定义索引[重复]时javascript连接错误

myarray = [];
myarray[10] = 'AAA'; myarray[30] = 'BBB'    
result = myarray.filter(x => x != '' && x != undefined).join('|')
console.log(result)

var array = [],
    result;

array[10] = "AAA";
array[30] = "BBB";
array[50] = "CCC";
array[60] = "DDD";
array[80] = "EEE";
array[81] = "FFF";
array[82] = "GGG";
array[83] = "HHH";
result = array.filter(_ => true).join('|');
    
console.log(result);

let arr = [];
arr[10] = "AAA", arr[30] = "BBB", arr[50] = "CCC", arr[60] = "DDD", arr[80] = "EEE", arr[81] = "FFF", arr[82] = "GGG", arr[83] = "HHH";

let result = arr.filter(v => !!v).join('|');
console.log(result);