Question

我正在创建一个测验，该测验根据用户的答案打印俱乐部列表。但是，当我运行它时，我不需要的每个数组之间都有一个逗号。

我试图删除逗号，但是为了使代码正常工作，在每个项目之间都必须使用逗号。

我有以下列表： var clubs=[[" Fall Production"," Spring Musical", ""],["Student Government", ""],["Tricorn", ""],["FBLA", ""]...] //and it continues

然后使用此功能打印它们：

function eliminateClubs(){
for(h=0;h<=personChoices.length;h++){
   if (personChoices[h]==1){
     recClubs.push(clubs[h].join(', <br/>'));
   }
 }
}

打印时，它看起来像：

Fall Production,
Spring Musical,
, Student Government,
, Tricorn,
, FBLA,
etc...

我不知道如何消除出现在每个不同数组前面的逗号，但是每个项目后面的逗号都很好。

Answer 1

function eliminateClubs(){
 for(h=0;h<=personChoices.length;h++){
   if (personChoices[h]==1){
       if (clubs[h].indexOf(',') > -1)
       {
          clubs[h] = clubs[h].replace(',','');
       }
     recClubs.push(clubs[h].join(', <br/>'));
    }
  }
}

Answer 2

我建议您执行以下操作：

var p=[1,0,1,0];
var clubs=[[" Fall Production"," Spring Musical", ""],["Student Government", ""],["Tricorn", ""],["FBLA", ""]];
console.log(clubs.filter((a, i) =>p[i]==1).flat().filter((a) =>a ).map(a=>a.trim()).join(',<br>'));

Answer 3

尝试一下：

const clubs = [
    ["Fall Production"," Spring Musical", ""],
    ["Student Government", ""],
    ["Tricorn", ""],
    ["FBLA", ""]
];

// filter empty values of arrays of strings
const filteredClubs = clubs.map(arr => arr.filter(a => a));

// convert filteredClubs in a one level array
const oneLevelArrayClubs = filteredClubs.reduce((acc, next) => acc.concat(next));


// join them with what you wanted
const clubsString = oneLevelArrayClubs.join(', <br/>');

Answer 4

您可以简单地Array.flatMap遍历数组并使用Array.filter：

var clubs=[[" Fall Production"," Spring Musical", ""],["Student Government", ""],["Tricorn", ""],["FBLA", ""]]

let result = clubs.flatMap(x => x.filter(y => y))

console.log(result)

然后，如果要添加换行符和修剪等操作，则可以再执行一次Array.map。如果您的数据更干净，则可以跳过该步骤，因此，如果可能，请尝试纠正这些空白等

let result = clubs.flatMap(x => x.filter(y => y)).map(x => x.trim())

注意： Array.flat和Array.flatMap都在IE中不支持，因此您需要使用polyfill

您可以使用Array.map / Array.reduce避免这种情况，

var clubs=[[" Fall Production"," Spring Musical", ""],["Student Government", ""],["Tricorn", ""],["FBLA", ""]]

let result = clubs.map(x => x.filter(y => y)).reduce((r,c) => [...r,...c], [])

console.log(result)

有没有办法删除Javascript中数组之间的逗号？

4 个答案: