Extra white space on my page
I recently created a new site, collecting some useful cheatsheets. But on the page regarding to topic of Markdown, a funny thing happened without giving me any clue of why. There was some empty space
About eval in Shell
The textbook says in bash scripting, eval plays a role that the expression comes after will be evaluated twice before the final execution. By saying evaluation, it means the variables begining with $
Why my <a> tag can not be clicked
I wrote some codes below:1234<body> <div class="container"> <a href="../index.html" id="return"><button class="btn">Return</button></a> <h1 id="toc_0">Typ
TCP 3-way Handshake
TCP (Transmission Control Protocol) and UDP (User Datagram Protocol) both work in the transportation layer. TCP is a connection-oriented protocol, while UDP is considered as a connectionless protocol
Expression vs. Statement
There are a lot of explanations online for distinguishing those two concepts. As in the answers of this question says, Expressions only contain identifiers, literals and operators, where operators i
Create a 2-dimensional Array in JavaScript
When I tried to create a two-dimensional array today, I surprisingly discovered that there is no built-in function which can help us to create two-dimensional array in JavaScript. I searched online an
Build personal blog with Hexo Part 2
Part 2: Deploy to GitHubConfigure GitHub In the upper-right corner of any page, click +, and then click New repository. Enter name for your blog project, which must be following this pattern: <us
Build personal blog with Hexo Part 1
Part 1: Install HexoPrefaceBuilding personal blogs has never been easier. There are a lot of good choices, free of charge, like blogspot, Sina blog, wordpress.com, etc. But I want something clean, se
Interfacing an LED and debouncing switch
Setup the circuitry and program for Interfacing an LED and Switch with Raspberry PiCircuit Diagram: Code:12345678910111213141516171819202122232425from time import sleepimport RPi.GPIO as GPIO GPIO.se
Recursion and Stack memory
When I was thinking about the problem Validate Binary Search Tree, my code runs like this: 12345678910111213141516171819public boolean isValidBST(TreeNode root) { TreeNode previous = null;