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Paradigms of Iteration in JavaScript
One of the joys of programming is that no matter how simple a problem may seem there are always tons of ways to solve it. It can be good practice to go back and revisit fundamentals by solving simple problems with as many implementations as you can think of. In this post we'll explore approaches to basic iteration in JavaScript. This style of exercise is a good interviewing technique, too, because it's open ended and leads to good discussions. The focus isn't a tricky, wacky problem you're...
JavaScript,Iteration,Wrap,Recursive,For,Loop 2012-01-08 10:11:15
Build a Kubectl Plugin from Scratch
by author The command-line tool kubectl is indispensable when using Kubernetes. You need it to query related Pod and Service information both in developing or performing some maintenance operations, such as events, scale, rolling update, etc. However, when using kubectl, there are many inconveniences. Though Kubernetes is officially maintaining kubectl¹, and you can submit the problems, improvement, and even PR in its Github Issues, you still have to wait long before its release. The m...
A plugin to update last_error in Delayed Job
delayed_job is a process based asynchronous task processing gem which can be ran at background. It will fork the specified number of processes to execute the tasks asynchronously. The task status is usually stored in the database so that it can be easily integrated into a Rails application where asynchronous job execution is desired. Normally when a job fails to execute or error occurs, it would save the error into the database with the column last_error. Ideally all these will be handled b...
RUBY,RUBY ON RAILS,DELAYED JOB,LAST_ERROR 2017-11-18 13:05:49
Why is my IP blocked at a website I visit regularly after I changed ISPs?
I just installed a new Express Card with Verizon Broadband wireless last night. Had tons of fun accessing the web from places I usually cannot, (we are in trucking) until I got to my favorite forum. It's a public place I have been to thousands of times, but instead of happily browsing all the daily news events and checking to see if the world blew up yet, I found myself blocked by a big white screen that said YOUR IP ADDRESS HAS BEEN BANNED. What can I do? I can't go to the forum owners to ...
ISP,IP Block,StopForumSpam,Solution 2012-02-01 08:53:38
A String is not an Error
I decided to write a little article to discourage an unfortunately common pattern in Node.JS modules (and browser JavaScript, to a lesser extent) that can boil down to these two examples: // A:function myFunction () { if (somethingWrong) { throw 'This is my error' } return allGood;} and // B: async Node.JS-style callback with signature `fn(err, …)`function myFunction (callback) { doSomethingAsync(function () { // … if (...
JavaScript,Node.js,String,Error object 2011-12-23 08:00:32
Update & Delete Kubernetes resources in one-line command
It recently troubles me that my GKE cluster is managing more and more resources and causing difficulties in maintenance, one of which involves how to delete resources properly. Next, I will explain step by step the difficulties I encountered in my work and how I finally used the combination of bash commands and kubectl to implement the edition of Kubernetes objects through one-line command. In general The following are the basic operations that almost every Kubernetes user takes. Check ðŸ‘â€...
KUBERNETES 2020-11-01 04:16:47
Simple tutorial on git cherry-pick
It is a common operation to move code from one branch to another branch in a multi-branch git repository. Normally there are two scenarios: Want to move all changes in one branch to another branch, now it's called git merge Want to move only some change/changes from one branch to another branch, now it's called git cherry-pick Usage The purpose of git cherry-pick is to apply some change from one branch to another branch. git cherry-pick [commitHash] The above command is to app...
GIT,GIT CHERRY-PICK,TUTORIAL 2020-05-02 00:02:58
ScrollerJS vs Odometer
Both ScrollerJS and Odometer are two JavaScript libraries to transition one number to another number with animation. They provide user a fancy animation about scrolling numbers. These libraries can be used in many scenarios such as user statistic counter, timer or odometer. This post is going to have a comparison on these two open source libraries. Below is a table which lists the features the two libraries have: Feature ScrollerJS Odometer Language JavaScript and CSS JavaScript and CSS S...
JavaScript, Odometer, ScrollerJS, Open source, CSS Transition 2015-05-13 02:10:55
Peter Thiel thinks tech innovation has 'stalled'
Peter Thiel says the United States no longer cares much about science or technology(Credit: Declan McCullagh/CNET)ASPEN, Colo.--One of the Internet's most influential investors and entrepreneurs is offering a dire prediction: the pace of technological change is stagnating.Peter Thiel, a co-founder of PayPal and early investor in Facebook, warned that--despite spectacular advances in computer-related fields over the last few decades--technological progress overall is actually "stalled out.""There...
Peter Thiel,PayPal,Technology,Stack,Inno 2011-08-24 08:42:42
Macro vs. Micro Optimisation
So there's recently been a bit of hype about another Colebourne article: http://blog.joda.org/2011/11/real-life-scala-feedback-from-yammer.html I'd like to respond to a few points he makes. First - You should evaluate Scala and pay attention to its benefits and flaws before adopting it. Yes, there are flaws to Scala. Working at typesafe makes you more aware of some of them. We're actively working to reduce/minimize/get rid of these. In my opinion, the negat...
Optimization,Performance,Micro,Macro,Software 2011-11-30 12:04:25
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