sort

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I am trying to separate the negative & positive elements of an array in Javascript, such that afterwards first come all negative elements and then the positive elements, each in the original order. Example: Input array: [1,2,-3,-2,4] Output array: [-3,-2,1,2,4] Input array: [3,2,-1,0,-4,3,6,-7,-6] Output array: [-1,-4,-7,-6,3,2,0,3,6] I can do it using a temporary array with use of push() method, but how to do this without using a temporary array in that array only? 回答1: Use sort() var res = [1, 2, -3, -2, 4].sort(function(a, b) { return a -

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a stupidly large text file (i.e. 40 gigabytes as of today) that I would like to filter for unique lines without sorting the file. The file has unix line endings, and all content matches [[:print:]] . I tried the following awk script to display only unique lines: awk 'a[$0] {next} 1' stupid.txt > less_stupid.txt The thought was that I'd populate an array by referencing its elements, using the contents of the file as keys, then skip lines that were already in the array. But this fails for two reasons -- firstly, because it inexplicably

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: All my directives use the same scope and I want my directives to operate by their own. Directive: app.directive('headerSort', function () { return { restrict: 'A', controller: function ($scope, $element, $attrs) { $scope.caption = $attrs.caption; $scope.doSort = function () { $scope.orderField = $attrs.headerSort; $scope.reverse = !$scope.reverse; }; }, template: '<div data-ng-click="doSort();">' + '{{caption}}' + '<i class="icon-sort"></i>' + '</div>' }; }); Html: <th data-header-Sort="FullName" data-caption="Full name"></th> <th data

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a data.table with about 3 million rows and 40 columns. I would like to sort this table by descending order within groups like the following sql mock code: sort by ascending Year, ascending MemberID, descending Month Is there an equivalent way in data.table to do this? So far I have to break it down into 2 steps: setkey(X, Year, MemberID) This is very fast and takes only a few second. X This step takes so much longer (5 minutes). Update: Someone made a comment to do X and later deleted. This approach seems to be much faster: user

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: As far as I know, it's possible to sort populated docs with Mongoose ( source ). I'm searching for a way to sort a query by one or more populated fields. Consider this two Mongoose schemas : var Wizard = new Schema ({ name : { type : String } , spells : { [{ type : Schema . ObjectId , ref : 'Spell' }] } }); var Spell = new Schema ({ name : { type : String } , damages : { type : Number } }); Sample JSON: [{ name : 'Gandalf' , spells : [{ name : 'Fireball' , damages : 20 }] }, { name : 'Saruman' , spells : [{ name : 'Frozenball' ,

参考：https://www.cnblogs.com/94cool/p/6230202.html 解决方法： 1、在实体类加：[BsonIgnoreExtraElements] 2、或者定义public ObjectId _id { get; set; } 例子： [BsonIgnoreExtraElements] public class BaseData { // public ObjectId _id { get; set; } public string cNo { get; set; } public string customer { get; set; } public long batchNo { get; set; } public DateTime mDate { get; set; } public string mUser { get; set; } } 顺便保存下数据库帮助类 public class MongoDBHelper { #region 构造函数(初始化集合,子类需重写集合名) /// <summary> /// 集合 /// </summary> public string _collName { get; set; } public MongoDBHelper(string collName) { this._collName =

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 由 翻译 强力驱动 问题: I am reading a directories content using QDir::entryList() . The filenames within are structured like this: index_randomNumber . png I need them sorted by index , the way the Windows Explorer would sort the files so that I get 0_0815.png 1_4711.png 2_2063.png ... instead of what the sorting by QDir::Name gives me: 0_0815.png 10000 _6661 . png 10001 _7401 . png ... Is there a built-in way in Qt to achieve this and if not, what's the right place to implement it? 回答1: If you want to use QCollator to sort entries from the list of

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a list of tuple s, each tuple contains two integers. I need to sort the the list (in reverse order) according to the difference of the integers in each tuple, but break ties with the larger first integer. Example For [(5, 6), (4, 1), (6, 7)] , we should get [(4, 1), (6, 7), (5, 6)] . My way I have already solved it by making a dictionary that contains the difference as the key and the tuple as the value . But the whole thing is a bit clumsy. What is a better way? 回答1: Use a key function to sorted() and return a tuple; values will be

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: CHECK UPDATE 3 below I found out the issue I ran into is related to a known serious problem with c# string comparers for .Net 4.0, 4.0 client and 4.5, that will lead to inconsistent sort order of lists of strings (causing the output to depend on the order in the input and the sort algorithm used). The problem was reported to Microsoft in Dec 2012 and closed as "won't be fixed". A work around is available, but is so much slower that it is hardly practical for large collections. While implementing an immutable PatriciaTrie, I wanted to compare

可以将文章内容翻译成中文,广告屏蔽插件可能会导致该功能失效(如失效，请关闭广告屏蔽插件后再试): 问题: I have a DataTable that looks like below; | ID | ItemIndex | ItemValue ce895bd9-9a92-44bd-8d79-986f991154a9 1 3 ae7d714e-a457-41a8-8bb4-b5a0471c3d2f 2 2 a774dff3-acc0-4f50-a211-a775e28dcae3 2 1 292bbd50-290b-4511-9e4e-2e74e3ebe273 3 2 ae7d714e-a457-41a8-8bb3-b5a0471c3d22 3 1 I want to sort this table by ItemIndex first, then sort the sorted table by ItemValue . How can I achieve this? Edit: after sorting, I want my table like below; | ID | ItemIndex | ItemValue ce895bd9-9a92-44bd-8d79-986f991154a9 1 3 a774dff3-acc0-4f50-a211-a775e28dcae3 2 1