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  Understanding the "this" keyword in JavaScript

Many people get tripped up by the this keyword in JavaScript. I think the confusion comes from people reasonably expecting this to work like “this” does in Java or the way people use “self” in Python. Although this is sometimes used to similar effect, it’s nothing like “this” in Java or other languages. And while it’s a little harder to understand, its behavior isn’t magic. In fact, this follows a relatively small set of simple rules. This...

   JavaScript,this,understanding     2012-03-29 13:48:59

  That “JavaScript not available” case

During some interesting discussions on Twitter yesterday I found that there is now more than ever a confusion about JavaScript dependence in web applications and web sites. This is a never ending story but it seems to me to flare up ever time our browsing technology leaps forward. I encountered this for the first time back in the days of DHTML. We pushed browsers to their limits with our lovely animated menus and 3D logos (something we of course learned not to do again, right?) and we were ...

   JavaScript,Security,Banned,Reason     2012-01-04 02:37:35

  How does CSDN dare to use plain text as password?

Recently, the China's largest Chinese IT community website named CSDN leaked its user's account information. Later today CSDN made an announcements to its users on their website. The announcement said that some user account information was leaked and the passwords of the accounts were stored as plain text in their database before 2009, and after 2009, they adopted an encryption algorithm to encrypt user password. They urged all users who registered the account before 2009 to change their passwor...

   Security,Information leak,CSDN,Plain text     2011-12-22 09:10:01

  Tips to improve JavaScript efficiency

Writing JavaScript code is tedious and error prone. You not only need to implement the necessary functions, but also need to ensure cross browser compatibility. This often causes the low efficiency of JavaScript developers. Here we recommend 12 tips you can benefit from. 1. Remove array element by index If we want to remove one element in an array, we can use splice. function removeByIndex(arr, index) { arr.splice(index, 1); } test = new Array(); test[0] = ’Apple’; test[1] = &rsq...

   JavaScript,Tips,Array     2013-07-27 20:50:40

  Kubernetes: Docker out

Recently，The hottest news in the Kubernetes circle that docker will be deprecated has been confirmed by the release of 1.20. Docker support in the Kubelet is now deprecated and will be removed in a future release. The Kubelet uses a module called “dockershim” which implements CRI support for Docker and it has seen maintenance issues in the Kubernetes community. We encourage you to evaluate moving to a container runtime that is a full-fledged implementation of CRI (v1alpha1 or v...

   DOCKERSHIM,DOCKER,KUBERNETES     2020-12-19 21:10:21

  Learning Is More Important Than Knowing

Although DuckDuckGo's success is based more on ideology than technology, you'd have to be a pretty arrogant technologist to not appreciate and be impressed with what this small team (for a long time, 1 person) has accomplished. And while DuckDuckGo teaches us a number of valuable lessons (about business, and privacy), to me, the most important, is that good programmers should be measured by what they can learn, not what they already know. Gabriel Weinberg, DuckDuckGo's creator, has been wo...

   Learning,Knowing,Google,DuckDuckGo     2012-04-18 07:17:53

  How Query Optimizer Works in RDBMS

In a previous post, we discussed how the various relational operators are implemented in relational database systems. If you have read that post, you probably still remember that there are a few alternative implementations for every operator. Thus, how should RDBMS determine which algorithm (or implementation) to use? Obviously, to optimize the performance for any query, RDBMS has to select the correct the algorithm based on the query. It would not be desirable to always use the same algori...

   DATABASE,DATABASE DESIGN,DATABASE OPTIMIZATION     2019-04-20 07:26:32

  A Programming Idiom You've Never Heard Of

Here are some sequences of events: Take the rake out of the shed, use it to pile up the leaves in the backyard, then put the rake back in the shed. Fly to Seattle, see the sights, then fly home. Put the key in the door, open it, then take the key out of the door. Wake-up your phone, check the time, then put it back to sleep. See the pattern? You do something, then do something else, then you undo the first thing. Or more accurately, the last step is the inverse of the first. Once you're aware ...

   Programming,Idiom,Strange     2012-01-04 08:12:25

  How to be jQuery-free?

jQuery is now the most famous JavaScript library. There are around 57.3% websites in the world using jQuery, i.e, 6 out of 10 websites are using jQuery. If we only consider those websites which use libraries, then the percentage is even higher which is 91.7%. Although jQuery is very popular, its size is still a headache to many websites maintainers. The uncompressed jQuery 2.0 has a size of 235KB, the size is 81KB after optimization.The jQuery 1.8.3 which supports IE 6/7/8 has a uncompressed si...

   jQuery,JavaScript,ECMAScript,CSS3     2013-05-13 11:53:20

  Prototypes in JavaScript

Following on from his previous article, David Chisnall explores JavaScript as an example of prototype-based object orientation. In this article, he shows how it's possible to implement more complex object models on top of this simple abstraction.My previous article, Prototypes and Object Orientation, considered the differences between class-based and prototype-based object orientation. In this article, we'll look in a bit more detail at the workings of the JavaScript object model, since it'...

   JavaScript,Prototype,Object oriented,Obj     2011-09-02 11:44:12

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