This short blog can be used as a quick cheat-sheet for understanding how Web-browser processes the pages. In general everything in the page should be divided and considered under three sections: DOM objects, CSS objects and JS objects. While browser runs through the page it builds a tree out of objects which is later given to renderer to actually draw a page for user.

Parquet format is quite popular and well-used among big-data engineers, and most of the case they have setup to read and check the content of parquet files. But sometimes we may need to quickly check the content of parquet. There are many ways and tools to do that, but I would like to talk about the way to do that using S3 Select feature. Most people who has taken any aws course most probably heard about it, but it passes quickly and unnoticably to our ears. It is quite powerful quick tool to know.

I have come across hard problem in leetcode where modified bucket-sort need to be applied. It is good example how bucket-sort can be applied to resolve the problem quite easily.

Till now there is no official guide to import existing aws resources into CDK Stack. By searching AWS CDK docs you may find confusing messages about this fact. For example dynamodb docs has a title which says “Importing existing tables”, but deep-dive can reveal that it has limitations. As an example we can check out dynamodb related part. It says we can only create ITable kind of resources which is a bit different with original Table class. With ITable class we can do some operations over existing resource but they are limited. To my knowledge, CDK does not allow appropriate way of importing existing tables. I have discovered some walk-round by using CloudFormation feature.

Query Steps

Last year(2020) on march when Leetcode has started a monthly challenge I decide to try myself in it. I wasn’t new to leetcode, already was trying to solve problems at least one per day. But it’s well-known fact that people get easily deflected from the original goal because of daily life routines and responsibilities. It is difficult to make it your responsibility to solve the problems in Leetcode, unless you work for leetcode. So I decided to go with other option make it my routine. Leetcode started monthly challenge which was good chance to make it my routine.

I would like to share my work experience at Kakaopage (Korea) as a developer. It is one of the top Software Companies in Korea and very good place to work as a developer (<– for TL;DRs)

Ionic is another cross-platform framework which allows to use web developers quickly build their mobile apps. Originally Ionic has been used angular-js as a front-end framework. But starting from Ionic-4, two other popular front-end frameworks (react and vue) can be used.

It is possible to get IP address range from the github according to this. But the issue is that IP addresses are changed every week, It means we have to do the update every week and handle those new IP addresses.

There are number of courses and guidances about how to pass one of the most popular exams: AWS Certified Solutions Architect Associate. AWS is one of the top cloud providers of our days, and having one of the AWS certificates (yeah there are many kinds) would only help in Your carrier. I personally not big fan of exams, because while preparing for exam you become obsessed to pass the exam and may simply start memorizing everything. I prefer study everything deeply, aws is the real rabbit-hole if you start digging deeply. In this short post would like to share my experience how did I prepare and passed AWS Solutions Architect Associate Exam.