从Javascript中的对象数组过滤未定义 [英] Filtering undefined from array of objects in Javascript

问题描述

我在从本地存储创建的对象数组中整理出未定义时遇到麻烦。假设该对象数组为localStorage：

I am having trouble sorting out the undefined from the array of objects that was crated from local storage. Lets assume that this array of of objects is localStorage:

var arrObject = [{date：undefined，bus_name：Thomas＃1}; .. 。] 假设这有2个未定义的日期。

var arrObject = [{date: undefined, bus_name: Thomas #1};...] Assume this has 2 dates that had undefined.

我希望能够过滤出未定义的日期和在日期之内，因此，例如，如果在对对象进行排序之前使用过滤器对对象数组进行过滤，则将不包括 {date：undefined，bus_name：Thomas＃1}

I want to be able to filter out the date that has undefined and the bus_name that is within the date so for example, if I used filter for an array of objects before sorting them, then {date: undefined, bus_name: Thomas #1} will not be included in the array that will be sorted.

我将如何做到这一点？

谢谢！

更新：3/5/20

如果我有多于2列，我该怎么做？至少5，我要过滤和排序日期以及仅输出日期和bus_name

How would I accomplish this if I have more than 2 columns, lets say I have at least 5, I want to filter and sort date as well as only output date and bus_name

var arrObject = [{date：undefined，bus_name ：托马斯＃1，公交司机：托马斯，时间开始：上午9点，时间结束：下午5点}； ...]

输出： {date：...，bus_name：...}; {...}

推荐答案

我认为您应该提供带有条件字段的过滤器（一个是日期，另一个是bus_name）

i think you should provide filter with condation field (one is date, another is bus_name )

无论如何，我想清除以下内容：-

anyway i want clear it out that :--

 i) arrObject.filter(e => e.date)  // with this all {date: undefined } contain object will be filter and get data which have actual date value 

 ii) arrObject.filter(e => e.date === undefined) // give filter result with all date undefined  
iii) arrObject.filter(e => e.date === undefined && e.bus_name ) or arrObject.filter(e => e.date && e.bus_name)

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