javascript - 如果使用 Array.filter(?) 未定义值，则删除父对象和子对象

Question

问题:

我如何删除所有空的 emailAddress，如果没有 emailAddresses 批准，也删除该批准。

我当前的解决方案将在 emailAddress 完全为空时删除批准。但当存在两个 emailAddresses 而其中一个为空时(参见脚本输出与预期输出)

var request = {
 approvals: [
     {
       type: 'media',
       emailAddresses: [
        {emailAddress: 'frank@gmail.com'},
       ]
     },
     {
       type: 'other',
       emailAddresses: [
        {emailAddress: ''},
       ]
     },
     {
       type: 'scope',
       emailAddresses: [
        {emailAddress: 'kelly@yahoo.com'},
        {emailAddress: ''},
       ]
     }
   ] 
}
const filterOutEmptyEmails = (approval) => {
  if(approval.emailAddresses.filter(x => !!x.emailAddress).length){
    return true;  
  }
  
}

let output = request.approvals.filter(filterOutEmptyEmails);

console.log(JSON.stringify(output));
 
 

// EXPECTED OUTPUT:
// approval: [
//     {
//       type: 'media',
//       emailAddresses: [
//         {emailAddress: 'frank@gmail.com'},
//       ]
//     },
//     {
//       type: 'scope',
//       emailAddresses: [
//         {emailAddress: 'kelly@yahoo.com'},
//       ]
//     }
//   ] 
// }]

Live Code

Answer 1

您没有替换代码中的 approval.emailAddresses - 您应该使用:

approval.emailAddresses = approval.emailAddresses.filter(x => !!x.emailAddress);

请看下面的演示:

var request={approvals:[{type:'media',emailAddresses:[{emailAddress:'frank@gmail.com'},]},{type:'other',emailAddresses:[{emailAddress:''},]},{type:'scope',emailAddresses:[{emailAddress:'kelly@yahoo.com'},{emailAddress:''},]}]};
                        
var filterOutEmptyEmails = (approval) => {
   approval.emailAddresses = approval.emailAddresses.filter(x => !!x.emailAddress);
  if(approval.emailAddresses.length){
    return true;  
  }
}

var output = request.approvals.filter(filterOutEmptyEmails);

console.log(JSON.stringify(output));

编辑:

另一个不改变输入数组的提议 - 使用 Array.prototype.reduce 创建一个新数组:

var request={approvals:[{type:'media',emailAddresses:[{emailAddress:'frank@gmail.com'},]},{type:'other',emailAddresses:[{emailAddress:''},]},{type:'scope',emailAddresses:[{emailAddress:'kelly@yahoo.com'},{emailAddress:''},]}]};
                        

var output = request.approvals.reduce(function(p,c){
  // creates a shallow copy
  var elem = Object.assign({},c);
  // replaces the reference to request.approvals by the new array created by the filter
  elem.emailAddresses = elem.emailAddresses.filter(x => !!x.emailAddress);
  if(elem.emailAddresses.length != 0)
    p.push(elem);
  return p;
},[]);

// console.log(request.approvals);
console.log(output);

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