I have been a Vim user for a long time. However, I found that Vim is not good enough for me to write blog with Pelican. I need a good reStructuredText previewer, but I am not very satisfied with InstantRst. I wish to have a two-panel editor that I can …
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Colon Built-in in Bash
I came across a weird line in a shell script:
: ${parameter:=word}
It is so weird that I don't even know how to search for further information. Fortunately, I found a post after searching bash colon. It is a built-in utility which simply exits with 0. In the other words …
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Open and Close Files in Bash
In a shell script, file descriptor 0 stands for stdin, file descriptor 1 stands for stdout, and file descriptor 2 stands for stderr. In addition, programmers can open, close, or duplicate file descriptors with the
execbuilt-in command and the I/O redirection operator:Syntax Description exec $fd< "${filepath}"Open … -
JavaScript Object.defineProperty()
In Javascript, we can add a property to an object with:
obj.property = value;
However, sometimes we would like to have fine-grained control over properties. With
Object.defineProperty(), we can decide:Descriptor Purpose Default value Property value undefinedwritable Whether the property can be assigned falseget Getter of the … -
NPM Package Manager
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Flask and Socket.IO
Under some scenarios, we would like to push a message from an HTTP server to clients. For example, in a group messaging application, whenever a user sends a message to the server, the server has to push such message to everyone. Since 2001, several techniques have been proposed. Eventually, WebSocket …
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Vim Ctrl-P Plug-in
Ctrl-P plug-in allows us to open files with fuzzy names or regular expression matches. It boosts my productivity at lot! I am glad to know about this plug-in and I would like to share my experience with you.
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Python New Style Class
Recently, I am curious about this code snippet:
class Test(object): def __init__(): pass
Why do we have to extend or inherit from
objecttype?There are no differences with or without
(object)in Python 3. But there are significant differences in Python 2. If a class inherits (either directly … -
A Quick Guide to Grunt
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JavaScript Prototype and Object Oriented
Javascript is a prototype-based object-oriented programming language. Unlike the conventional class-based object-oriented programming languages (e.g. C++ or Java), which ask programmers to write a class and then instantiate several similar objects from the class, Javascript adopts a different approach. In the world of Javascript, we have to craft a …
