按日期排序的对象嵌套数组 [英] Sorting nested arrays of objects by date

问题描述

我想数组排序，看起来像这样：

I'm trying to sort an array that looks like this:

var dateGroups = [
  [
     {age:20, date: Fri Feb 03 2012 14:30:00 GMT+1100 (EST)}, 
     {age:12, date: Fri Feb 03 2012 18:20:00 GMT+1100 (EST)}, 
     {age:18, date: Fri Feb 03 2012 21:43:00 GMT+1100 (EST)}
  ],
  [
     {age:32, date: Fri Feb 01 2012 10:54:00 GMT+1100 (EST)}, 
     {age:44, date: Fri Feb 01 2012 11:45:00 GMT+1100 (EST)}, 
  ],
  [
     {age:22, date: Fri Feb 05 2012 10:54:00 GMT+1100 (EST)}, 
     {age:22, date: Fri Feb 05 2012 18:22:00 GMT+1100 (EST)},
  ]
]

dateGroups嵌套的数组内的对象已经按升序排序，但我也想基于分组日期阵列自行分拣。

The objects inside dateGroups' nested arrays are already sorted in ascending order, but I also want to sort the arrays themselves based on the grouped dates.

在这种情况下，数组应该再是这样的：

In this case the array should then look like this:

var dateGroups = [
  [
     {age:32, date: Fri Feb 01 2012 10:54:00 GMT+1100 (EST)}, 
     {age:44, date: Fri Feb 01 2012 11:45:00 GMT+1100 (EST)}, 
  ],
  [
     {age:20, date: Fri Feb 03 2012 14:30:00 GMT+1100 (EST)}, 
     {age:12, date: Fri Feb 03 2012 18:20:00 GMT+1100 (EST)}, 
     {age:18, date: Fri Feb 03 2012 21:43:00 GMT+1100 (EST)}
  ],
  [
     {age:22, date: Fri Feb 05 2012 10:54:00 GMT+1100 (EST)}, 
     {age:22, date: Fri Feb 05 2012 18:22:00 GMT+1100 (EST)},
  ]
]

用于排序也应该返回dateGroups新版本的排序功能。

The function used to sort should also return the new sorted version of dateGroups.

我已经尝试过使用Underscore.js的 sortBy（） 功能，但我无法弄清楚如何基于属性内的对象之一值的数组进行排序。是否有日期对象进行排序以特定的方式？或者，他们以同样的方式为数字或字母？

I've tried using Underscore.js's sortBy() function but I can't figure out how to sort the arrays based on the value of a property inside one of the objects. Is there a specific way to sort Date objects? Or are they sorted in the same way as numbers or letters?

推荐答案

据Underscore.js文档，你应该简单地写自己对那些问题的迭代器。事情是这样的：

According to Underscore.js documentation, you should simply write your own iterator for that cause. Something like this:

_.sortBy(dateGroups, function(arrayElement) {
    //element will be each array, so we just return a date from first element in it
    return arrayElement[0].date.getTime();
});

这篇关于按日期排序的对象嵌套数组的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！