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Source:http://www.jianshu.com/p/d24dfbb33781 This document is translated from: How to Close Channels in Golang elegantly.A few days ago, I wrote an article explaining the use of channel in Golang. In Reddit and HN, that article received a lot of approval, but I also received the following criticism about the Go Channel design and specification: There is no simple and common way to check if the channel has been closed without changing the channel state
even if you have millions of users, there will be millions of new points per minute.The pattern is this, each time we get a new score, we use this code:ZADD leaderboard You may replace username with a userid, depending on how you designed it.Getting the top 100 high-score users is simple:ZREVRANGEleaderboard099The global rankings for users are similar, and only need to:ZRANK leaderboard4, according to the user vote and time sortingA common variant pattern of the leaderboard is, like
storage. In the next article, we will actually create a database on the server, which is much simpler than this article. Share this: Twitter Facebook Reddit LinkedIn - Tumblr Pocket Email 2 Comments 18.Francesco Mantovani Interesting, but how files is stored into the file system?Few days ago I imported a. txt file of 200MB size and once imported into SQL Server the size is up to 500MB.Why
Tags: share tree optimizer seq through php lib URL modOriginal: http://www.ruanyifeng.com/blog/2014/07/database_implementation.html The simplest implementation of a databaseNanyi Date: July 4, 2014 In all applications, the database can be the most complex. MySQL's manual has more than 3,000 pages, and PostgreSQL's manual has more than 2000 pages, and Oracle's manuals are even thicker than they add. But it's not hard to write a simple database of your own. R
Tags: style blog http color os using IO file dataIn all applications, the database can be the most complex.MySQL's manual has more than 3,000 pages, and PostgreSQL's manual has more than 2000 pages, and Oracle's manuals are even thicker than they add.But it's not hard to write a simple database of your own. Reddit There is a post, only hundreds of words, the principle is clear. Here's what I've organized based on this post.Data is saved in text form.T
Source: RuanyifengIn all applications, the database can be the most complex.MySQL's manual has more than 3,000 pages, and PostgreSQL's manual has more than 2000 pages, and Oracle's manuals are even thicker than they add.But it's not hard to write a simple database of your own. Reddit There is a post, only hundreds of words, the principle is clear. Here's what I've organized based on this post.Data is saved in text form.The first step is to write the d
understand the internal mechanisms. Although now you will feel that these concepts are complex, it is difficult to understand, because one day, you will be grateful for your choice now, saying goes, book to time to hate less, not to use when the regret.What languages should I study? View larger imageCommunity--stackoverflow, RedditHere are some of the reddit above for general programming: HTTP://WWW.R eddit.com/r/ Programmers HTTP://W
C #, Source: http://www.cnblogs.com/wintersun/ MemcachedIt is an open-source high-performance distributed cache component and has been widely used in various Internet fields. client Development kits with multiple languages, including Perl/PHP/JAVA/C/Python/Ruby/C #/MySQL. this site is already using YouTube, Reddit, Zynga, Facebook, Orange. viewThe following figure compares the image. It is also a platform for expansion. Today we are looking at the
, [_ [_/_] + _ [_ + ~ $] + $ _ [_] + $] (_/_) => ["False" [1] + "false" [3-1] + "true" [3] + "rt"] (3/3) => ["a" + "l" + "e" + "rt"] (1) => ["alert"] (1) Therefore, the original expression can be replaced: ($ = [[] ["Sort"]) () ["alert"] (1) How is this code executed? Let's analyze it step by step: A = [[] // create an array B = a ["sort"] // obtain the sort method of the array C = B () // call the sort method of the array. Here, B () returns the window object. D = c ["alert"] // obtain the wind
other dependencies? If you say you want to develop your own log library, write your own HTTP client, develop your own general-purpose library, then I can only say that such developers are wonderful, put out of the box, but also to "reinvent the wheel."You're using x now, you should move to Y.I have found that many community sites have this view, especially in Reddit. When someone issues a post about Java EE and spring, there are two people who are in
protect programmers ' eyesight.paint.net--based on. NET implementation of fast and free image processing software.winrar--Compression management tool.Treesize free--hard Disk Management tool to display the folder size.lastpass--is an excellent online Password manager and page filter with powerful encryption algorithms, automatic login/Cloud Sync/cross-platform/support for multiple browsers.Useful website Resources Dew Drop Thedailywtf Reddi
think that repeated exercises are especially boring, so they usually choose to skip or try to take shortcuts. If you enter JavaScript to practice, more learning time is required. Try to make the exercises interesting. Isn't it so resistant? Try to change your mindset: What if you want to learn a new JavaScript concept but cannot try it? How do you feel? Personally, I will be particularly upset. This is like a child getting a new toy, but cannot play. When you learn something new in JavaScript,
9, and some may still be included in iOS 11, hackers can analyze the source code to find security vulnerabilities.In Apple's request to delete the source code, it seems that the authenticity of the leaked source code is also confirmed, Apple said:According to these laws, the files in the following repositories identified by URLs are invalid because, except for other matters, these files provide for the distribution of copyright items without the authorization of the copyright owner;Copy the sou
protect programmers ' eyesight.paint.net--based on. NET implementation of fast and free image processing software.winrar--Compression management tool.Treesize free--hard Disk Management tool to display the folder size.lastpass--is an excellent online Password manager and page filter with powerful encryption algorithms, automatic login/Cloud Sync/cross-platform/support for multiple browsers.Useful website Resources Dew Drop Thedailywtf Reddi
required by the password, and disable a 3-bit or longer numeric sequence/[0-9] {3 ,}/? You can take a small step forward after that. The same character cannot be repeated more than twice in a line (adjacent /(.) 1 {2,}/, and there is not much trouble. This eliminates most of the troubles and does not require unnecessary restrictions on your user password selection.Update Better yet, why not forget all these rules and only use one minimum password strength requirement. Suggestions from
MobileSubstrate. For example, the Reddit user finds that SektionEins? The Unflod (aka SSLCreds or Unflod Baby Panda) analyzed )?, It intercepts SSL encrypted communication and steals the password of an Apple account. The AppBuler found last year also used the same technology to steal passwords and purchase apps in the app store. KeyRaider? The secondary technology was further utilized. KeyRaider? Mainly implements malicious behaviors. ● Theft of Appl
Many users have encountered blue screen of Death (BSOD) in the use of Microsoft Windows 10 system, although the Internet is always complaining, but there are many users using Windows 10 has never met the BSOD blue screen interface, the correct configuration makes them run very smoothly. Now there's an opportunity on Reddit for these users to experience a blue screen in peacetime, yes, a 4K resolution of Windows BSOD blue screen wallpaper. 650)
update.Another more significant problem is that, during installation, a black screen was produced, and a Reddit user said:After the cumulative update was installed, my computer screen was completely black. On the Welcome screen, most of my avatars and backgrounds are in a black screen state, I can move the mouse, the keyboard can also respond, but also can use the Control-alt-delete combination command, but in addition to restart what can I do? This
tools such as sass, less and other simplification of the process. However, CSS itself has some drawbacks, such as CSS is a very global thing, namespaces need to add themselves (so the Sassless class of "programming language"), and in many cases can not be reused, I have always felt like to write the inline style, However, in order to maintainability are as far as possible written in the CSS file.However, the effect of the style is classified as 1 in the above-mentioned stack network. Layout; 2.
them in different categories.ThemeIf you like a bright theme like white or High contrast, you can change it in Settings > General > Themes. (Keeweb) There are four themes to choose from, two of which are dark and the other two are bright colors.don't like Linux Password Manager? Then there are two other Linux password managers, Keepass and encryptr, with some arguments about them on Reddit and other social media. Some people oppose the use of any pas
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