The EPERM error in npm when using TFS and Visual Studio and how to solve it

When you work with Team Foundation Server (TFS) and Visual Studio and you do web development, chances are that you will come across the EPERM error when npm tries to change a file in your application. The complete error message is Error: EPERM: operation not permitted, rename and then the absolute path to the problematic file follows.

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How to style a scrollbar by using only CSS features and have a cross browser support

For your new web application, you might want to style the scrollbar so that it fits to the general design.

You can either use JavaScript code to achieve the styling or you could stick to CSS properties and pseudo-selectors.

In this article we pick the second variant and our main goal is to have a cross browser support for a styled scrollbar.

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A list of things to think of before deciding to use a distributed cache

Choosing the right cache software for your web application is not an easy job. The first and most important question that you have to ask yourself is if you actually need a cache in your application. But what exactly is a cache and how an application can profit or not from its use?

A cache is a software component that is used for storing data in memory (RAM) in order to provide faster accesses to this data. Using a cache you can save time and I/O operations, since you do not access the data stored in other slower types of storages suche as relational databases or XML files in a hard disk drive.

Most of the cache implementations provide a simple key-value storage, where the key is unique in the cache. The value can be then extracted by using the unique key. The type of the value can be from a simple primitive value (boolean, string, number) to a complex object. In both type-cases you have to serialize the key-value pair and most of the times store it a simple string in the cache (continue reading for more information about serialization and desirialization).

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Use the JavaScript ES6 Backtick (Template literal) feature to write multiline strings in HTML code

The ES6 specification of JavaScript and of course the TypeScript language, provide us the template literal syntax (the `` characters). With the template literals we can write multiline strings in JavaScript without having to use the old syntax. Take a look at the following example:

    var testString = "Lorem ipsum dolor sit amet, \
            \nconsetetur sadipscing elitr, \
            \nsed diam nonumy eirmod tempor \
            \ninvidunt ut labore et dolore";
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Possible causes of the "Mobile Usability > Content wider than screen" error message in Google Webmasters page

If you use the Google Webmasters for your webpage then you most probably have seen the Mobile Usability page under the Search Traffic menu. In this subpage Google lists for you CSS, HTML or SEO errors that have to do with the mobile version of your website. One of the most common errors that is listed there is the Content wider than screen error.

The content wider than screen error in Google Webmasters

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