In GoLang, it doesn't support method overloading like in Java, hence sometimes it would be a headache to create functions to construct new structs with different parameters. Normally, we would construct the new function as below when want to let others create a new struct instance with explicit function call.type Queue struct { Name string}func NewQueue(name string) *Queue { return &Queue{name}}But with the scope and complexity of the struct increases, there might be more properties added to Queue.type Queue struct { Name string MaxLimit int}How to enhance the NewQueue() to accomo...

Google has announced its plan to block mixed content downloads in Chrome in February 2020 and now the day to block mixed content downloads is coming soon as we are nearing October when Chrome 86 is supposed to be released.What is mixed content downloads? According to Google, it is non-HTTPS downloads started on secure pages. For example, if you access a page called https://example.com/download, and in this page, there is a download link to http://download.example.com/something, this download link will not work.This is a security measure from Google to improve security of downloa...

Blocking is a common occurrence in an SQL server context, but if you are new to the world of database management you might not know what this issue entails and perhaps even fear that it is a sign of serious underlying problems.To allay your fears and clear up the mystery, here is a brief overview of blocking and the steps you can take to tackle it.Image Source: PixabaySQL blocking explainedSQL blocking according to SentryOne is an offshoot of the way that concurrent databases operate. Because processes can be executed simultaneously, it is likely that at some point more than one process will n...

Installing a VPN on your device is one of the essential steps you need to take in order to have a safe and pleasant online experience. It good functioning is in your best interest and this is why you need to make sure that your VPN is working properly. Unfortunately, a lot of problems can occur if it turns out that your VPN is not up to the task and that it has some leaks. Can a leak really occur?To answer you most directly – Yes! Yes, it can! Unfortunately, no system is perfect and so it is possible that your VPN can have leaks. Now you may wonder how is it possible since one of VP...

Usually, image processing software will provide blur filter to make images blur.There are many algorithms to implement blur, one of them is called Gaussian Blur Algorithm. It utilizes Gaussian distribution to process images.This article is to introduce Gaussian Blur algorithm, you will find this is a simple algorithm. In fact, it is a kind of data smoothing which can be used in many situations.1. Gaussian Blur theoryThe so called blur can be understood as taking a pixel as the average value of its surrounding pixels.On the above graph, 2 is the center point, the surrounding points are 1.The ce...

The design of JavaScript is not so sophisticated. It's very easy for us to make mistakes if we are not very careful when using JavaScript. For example, to check the existence of JavaScript object.Now we want to check whether a global object myObj exists or not, if it doesn't exist, we declare it. The pseudo code for this is :if(myObj not exist){ declare myObj;}You may think it's very easy to write the code. In fact, it is much more difficult than we may think. Juriy Zaytsev says there are more than 50 ways to check whether a JavaScript object exist or not. Only if you are very clear about the ...

Image Source: UnsplashWeb scraping is a technique used to extract large amounts of data from websites and save onto your computer in a database or time table format. There are many reasons businesses would use this information for lead generation, SEO, or to better understand their customers. However, you can do a lot of fun projects in your free time that doesn’t have to be associated with work or a company. Before you start using your programming skills to find and extract information, it’s essential to know how to find a reputable guide for your web scraping project. H...

When we try to install wxPython lib on Ubuntu system to do software GUI development,most of time we may meet some installation and lib dependency problems. For the latest Ubuntu version, the problems still happen. Below are some common problems which happened frequently and their solution:---------------------------------------------------------------------------------------------------------------Problem [1]: Install wxPython on Ubuntu 20.04 fail because of dependency package Gtk is not installed.Error Message:No package 'gtk+-3.0' found Package gthread-2.0 was not found in the pkg-config sea...