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  How DNS lookup works

When accessing a website, a domain name would be needed normally. To get to the actual web server, the domain name must be mapped to an actual IP address and the IP address will be used to reach the web server. The process of finding the IP address from a domain name is called DNS lookup.  How does DNS lookup work? There are tons of domain name and IP address around the world, there must be some well-designed architecture to support fast lookup. This post will explain how this works. DNS Se...

   DNS,DNS LOOKUP     2022-09-09 23:11:03

  JavaScript interview questions

This post will cover the JavaScript questions I have encountered and have seen during my programming career. They will mainly focus on vanilla JavaScript though there are lots of excellent frameworks out there and many people are using them in their daily work. this keyword this keyword is an very important but easy to confuse concept in JavaScript since it is always referring to the calling object of the function. 1. What will be the output of below code snippet? function User(name) { this....

   JAVASCRIPT,ALGORITHM,THIS,CLOSURE     2019-03-09 07:05:46

  What can select do in GoLang

In Go language, select is a keyword used to listen to and perform IO operations related to channels. With the select statement, we can simultaneously listen to multiple channels and perform corresponding operations when any of the channels are ready. This article will summarize the common uses of the select statement and provide some considerations when using it. Basic syntax The basic syntax of the select statement is as follows: select { case <-channel1: // when channel1 has data to ...

   GOLANG,SELECT,USAGE,SYNTAX,TUTORIAL     2023-08-12 20:17:02

  Behavior of defer function in named return function

In Go, there is a special concept of named return value in function where a returned value can have name. For example, below is a named function in Go. func returnNamed() (i int) { i = 1 return } When the function returns, the return value i will have a value of 1.  Also, Go has a concept of defer which will execute a function just before the calling function exits. This is similar to what finally block does in other languages such as Java. For example, a defer function can be func deferF...

   GOLANG,DEFER,NAMED RETURN,DIFFERENCE     2018-11-20 09:04:07

  My frequently used Linux commands

In our day to day work. We may have many chances working on Linux/Unix systems. There are many things we may need to do, checking logs, navigating in directories, creating file or installing software. We may use many commands to complete the work, such as ls, mkdir, cd etc. Below are my frequently used Linux commands or programs recently: pwd : print working directory, sometimes I need to check which working directory I am in in order to know where to go next. ls : List current directory files,...

   Linux,Command,Program     2012-08-16 15:09:42

  How I explained MapReduce to my Wife?

Yesterday I gave a presentation at Xebia India office on MapReduce. It really went well and audience was able to understand the concept of MapReduce (as per their feedback). So, I was happy that I did a good job in explaining MapReduce concept to a technical audience (mainly Java programmer, some Flex programmer and few testers). After all the hard work and a great dinner at Xebia India office I reached back my home. My wife (Supriya) asked me “How was your session on …ââ‚...

   Java,MapReduce,Java Flex     2011-08-28 04:22:53

  Introducing Google JS Test

Google JS Test is a JavaScript unit testing framework that runs on the V8 JavaScript Engine, the same open source project that is responsible for Google Chrome’s super-fast JS execution speed. Google JS Test is used internally by several Google projects, and we’re pleased to announce that it has been released as an open source project.Features of Google JS Test include:Extremely fast startup and execution time, without needing to run a browser.Clean, readable output in th...

   Google,JavaScript,Test tool,Open source     2011-10-07 23:35:48

  Algorithm : Delete middle node from singly linked list

Questions about singly linked list are frequently asked during technical interviews. Today we will share with you one algorithm question about singly linked list. Here is the problem description. Assuming the only information you are giving is there is a pointer to a middle node of a singly linked list, no other information about the linked list is given. Please delete this node and don't affect the structure of the linked list. Initially you may think this question is easy if you know the hea...

   ALGORITHM,C,LINKED LIST     2015-10-30 05:21:25

  Cron Job in cPanel with PHP

Running PHP scripts automatically can have some big benefits. You can wait to have things get done when there is less traffic on your server, or you can ensure daily tasks get done on time. cPanel Simple CronEven if you do not know anything about cron jobs, and have never run a cron job before - you can get started with the simple cron tool built into cPanel. The url for it is: https://www.yoursite.com:2083/frontend/x/cron/simplecron.html? A few things you'll need is the path to php and the path...

   PHP,Cron,Autonomous Job,cPanel,Linux     2011-04-26 09:48:40

  Some tricks and tips for using for range in GoLang

GoLang provides two major ways to loop through elements of array, slice and map. They are for and for range. Many people find that for range is very convenient when don't care about the index of the element. In this post, some tricks and tips would be talked about regarding for range. 1. Loop and get pointer of each element Assume there is a code snippet like below which is to get the pointer of each element in an array and create a new array with the corresponding pointer. arr := [2]int{1, 2} r...

   POINTER,FOR LOOP,GOLANG,FOR RANGE     2020-03-08 01:07:00

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