Posts

Submit 1042-S in TurboTax when Filing as Resident Alien

Posted on March 11, 2019

F-1 students who have been in the U.S. for more than 5 years become resident alien for tax purposes. While filing 1040 is easier than 1040NR and tax software is readily available to assist you, it is not obvious how to input 1042-S, Foreign Person’s U.S. Source Income Subject to... [Read More]

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Personal Finance

MTU vs. MSS

Posted on March 11, 2019

When discussing packet sizes of a given network path, two parameters are often used: MTU or maximum transmission unit, and MSS or maximum segment size. [Read More]

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How to Mock in Scala Unit Tests

Posted on February 6, 2019

This post is a short summary of mocking in unit tests. I mainly use ScalaTest as the test framework and Mockito as the mocking library. This is not intended to be comprehensive; rather, it is my two cents on how to write maintainable and rich unit tests. [Read More]

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Scala

Docker —— 从入门到实践

Posted on January 14, 2019

这是我学习《Docker —— 从入门到实践》一书的笔记。书的内容可以在 gitbook 上找到。 [Read More]

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Learning

Manipulate Financial Data in Python

Posted on December 30, 2018

This is the notes for mini course 1 of Machine Learning for Trading, offered by Udacity. [Read More]

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Finance

在美国如何正确购买猪肉 Every Cut of Pork Explained

Posted on December 25, 2018

This post summarizes cuts of pork discussed in this video. [Read More]

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Life
Cooking

Work with NoSQL - a Few Lessons

Posted on December 24, 2018

Traditional relational databases are not suitable for cloud services anymore. Its vertical scaling model imposes a relatively low scaling limit to your services. Complicated sharding and replication schemes could be used to go beyond the capacity of the largest database machine, adding complexity to your system, reducing engineering velocity, and... [Read More]

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Add a Table of Contents to Jekyll Blog Written in Markdown

Posted on October 28, 2018

For my Jekyll blog I want to add a table of contents to some of my larger posts so readers have an overview of the post content and may click links to jump to sections which interest them most. I’d like Jekyll to automatically generate the markup for the table... [Read More]

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Jekyll

Udacity OS Course

Posted on October 28, 2018

This is the notes for Introduction to Operating Systems, offered by Udacity. [Read More]

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Computer Science

Financial Markets

Posted on October 16, 2018

This is the note series I took when studying for Financial Markets by Prof. Robert Shiller, offered by Coursera. [Read More]

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Finance

How to Use Your Roth IRA as an Emergency Fund

Posted on October 6, 2018

There is an often-overlooked feature of the Roth IRA: emergency fund. Subject to income limits, you can contribute as much as $5,500 annually into a Roth IRA. If you’re married, you and your spouse can each contribute $5,500, for a total of $11,000. [Read More]

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Personal Finance

AngularJS

Posted on October 5, 2018

AngularJS is a JavaScript framework. It can be added to an HTML page with a <script> tag. [Read More]

Leetcode 405: Convert a Number to Hexadecimal

Posted on September 9, 2018

Question Given an integer, write an algorithm to convert it to hexadecimal. For negative integer, two’s complement method is used. [Read More]

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Leetcode

Leetcode 402: Remove K Digits

Posted on September 9, 2018

Question Given a non-negative integer num represented as a string, remove k digits from the number so that the new number is the smallest possible. [Read More]

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Leetcode

Leetcode 401: Binary Watch

Posted on September 9, 2018

Question A binary watch has 4 LEDs on the top which represent the hours (0-11), and the 6 LEDs on the bottom represent the minutes (0-59). [Read More]

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Leetcode