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  1. Origin of Time Zones
  2. The Law and Time Zones
  3. Browser’s Time Zone Support and Its Limitations
  4. Time Zone Data and Its Problems
  5. Front End’s Solution
  6. Goodbye moment.js

For Koreans, Summer Time is not a very familiar concept. For those who live in the effective ranges of Summer Time, there are days when a day is 25 hours or 23 hours long. We usually take 24-hour days as the norm, but why do some countries fixate on such fluctuation?

Time zone is an idea to represent different times all around the world. Browsers, in order to account for these time zones, offer multiple solutions. …


Written by Sungho Kim

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It is always a crowd’s favorite to ask questions like “how should one test private methods?” and “Should one test private methods?” on different communities, and I have long thought to organize my thoughts and to write a summary for such questions. The topic itself is relatively straightforward, but the answer may differ from one developer to another. Especially, the topic seems extra divided in the international forums. However, in essence, this question can be boiled down to what effective test cases are.

Private methods were drafted within the object oriented perspective, and functions hidden in the closures, in the sense that they access the exposed functions from within, are products of the same concept. These ideas can all be categorized as encapsulated items that are hidden behind the module’s external interface, and can be called internal implementation for the sake of simplicity. Now the question remains, should you test the internal implementations? To save you some time, the answer is “no.” Well, actually the answer is “yes,” and by now it is fair for you to wonder what I’m on. You must refrain from directly writing test cases for internal implementations and should only test the exposed external interfaces. …


In the last weekly pick, I mentioned that the new improved features of Lighthouse will be updated.

This May, the Lighthouse 6.0 was officially released and is planned to be implemented to Chrome 84. If you are excited to try it out immediately, you can download the Chrome Nightly Build (Canary).

Brief Introduction of the Lighthouse

Lighthouse is a tool that is designed to audit and improve the web’s performance and can be found under the Chrome DevTools. It offers guidance and performance indices so that the pages that we build can be loaded faster and be interacted better by the users.

Such performance auditing tools are important to say the least. If you don’t see what the big deal is, try using the console.log to start the performance enhancement process for your webpage. You’ll see what I mean soon enough. You will soon be grateful for the numerous features and different timely information the Lighthouse provides. …

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JavaScript UI Library Open Source by http://ui.toast.com

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