如何将对象的空属性拼接成数组？

Question

所以我有一个对象数组，我想在一个对象的属性为空时对其进行切片。

例如：

var quotes = [
{
    quote: "Bolshevism is not a policy; it is a disease. It is not a creed; it is a pestilence.",
    source: "Winston Churchill",
    citation: "",
    year: "29 May 1919",
    place: ""
},
{
    quote: "Learn while you live",
    source: "",
    citation: "X",
    year: "1950",
    place: ""
}];

我有一个类似的对象列表，对象名称随机为空。

我只想将不为空的属性打印到页面。

所以我试图遍历对象以找到空属性的 indexOf() 并将其拼接：

function findEmptyProp(quotes) {
   for (prop in quotes) {
     if(quotes[i].children === '') {
        return indexOf(quotes[i]);
        quotes.splice(i, 1);
}}}

感谢您的帮助

Answer 1

拼接用于数组，但是当你处理对象时，你必须使用delete。

您可以尝试这样的操作：

var quotes = [{
  quote: "Bolshevism is not a policy; it is a disease. It is not a creed; it is a pestilence.",
  source: "Wyston Churchill",
  citation: "",
  year: "29 May 1919",
  place: ""
}, {
  quote: "Learn while you live",
  source: "",
  citation: "X",
  year: "1950",
  place: ""
}];

quotes.forEach(function(o){
  for (var k in o){
    if(o.hasOwnProperty(k) && isEmpty(o[k])){
      delete o[k];
    }
  }
});

function isEmpty(val){
  return val === undefined || 
    val === null || 
    (typeof(val) === "object" && Object.keys(val).length === 0) || 
    (typeof(val) === "string" && val.trim().length === 0)
}

console.log(quotes)

正如 deceze 评论的那样，我添加了对其他值可以被视为空的情况的处理。您还应该检查 hasOwnProperty 以更新其自身的属性。

Answer 2

仅供参考：毫无疑问，使用 Object.keys(obj) returns 对象键数组。例如。 ...

var arrayOfObjects = [
  {
    prop1: '1',
    prop2: '2',
    prop3: ''
  },
  {
    prop1: '1',
    prop2: '',
    prop3: '3'
  },
  {
    prop1: '',
    prop2: '2',
    prop3: '3'
  }
];

arrayOfObjects.forEach(function(obj) {
    /* 'obj' = each object in 'arrayOfObjects' */
    Object.keys(obj).forEach(function(key) {
        /* 'key' = each key in 'obj' */
        if (obj[key] === '') delete obj[key];
    });
});

/* test arrayOfObjects */
arrayOfObjects.forEach(function(obj) {
    console.debug(obj);
});

/** =>
    Object { prop1: "1", prop2: "2" }
    Object { prop1: "1", prop3: "3" }
    Object { prop2: "2", prop3: "3" }
**/

在对象上使用 .forEach()、.filter()、.sort()、.reduce() 和 .map() 等数组函数非常方便。

如何将对象的空属性拼接成数组？

How to splice an empty property of an object that's into an array?

javascript

arrays

object

splice

如何将对象的空 属性 拼接成数组？

How to splice an empty property of an object that's into an array?

javascript

arrays

object

splice

如何将对象的空属性拼接成数组？