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How to listen for changes to a MongoDB collection?
...goDB as the data store. How can I "listen" for inserts to a MongoDB collection before spawning workers to process the job? Do I need to poll every few seconds to see if there are any changes from last time, or is there a way my script can wait for inserts to occur? This is a PHP project that I am wo...
What does the “Just” syntax mean in Haskell?
I have scoured the internet for an actual explanation of what this keyword does. Every Haskell tutorial that I have looked at just starts using it randomly and never explains what it does (and I've looked at many).
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Large-scale design in Haskell? [closed]
What is a good way to design/structure large functional programs, especially in Haskell?
8 Answers
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Python xml ElementTree from a string source?
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Same problem as @SamuelLampa mentioned. I is not a ElementTree, I am not able to do getroot() for this
– Siddharth Menon
Aug 21 '13 at 9:30
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Media query to detect if device is touchscreen
...hscreen device? If there is no way, do you suggest using a JavaScript solution such as !window.Touch or Modernizr?
10 Ans...
CSS Font Border?
...r possible trick would be to use four shadows, one pixel each on all directions, using property text-shadow:
h1 {
/* 1 pixel black shadow to left, top, right and bottom */
text-shadow: -1px 0 black, 0 1px black, 1px 0 black, 0 -1px black;
font-family: sans; color: yellow;
}
&...
Programmatically generate video or animated GIF in Python?
... that I want to create a video from. Ideally I could specify a frame duration for each frame but a fixed frame rate would be fine too. I'm doing this in wxPython, so I can render to a wxDC or I can save the images to files, like PNG. Is there a Python library that will allow me to create either a...
How can I make a multipart/form-data POST request using Java?
In the days of version 3.x of Apache Commons HttpClient, making a multipart/form-data POST request was possible ( an example from 2004 ). Unfortunately this is no longer possible in version 4.0 of HttpClient .
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NSLog with CGPoint data
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Since StackOverflow saw fit to reintroduce this question in my RSS feed, I may as well pimp my general solution: jens.ayton.se/blag/almost-elegant-cave-man-debugging which allows you to go JA_DUMP(point); and get “point = { 43, 96 }” logged without having to worry about for...
App Inventor 2 数学代码块 · App Inventor 2 中文网
...数形式 (format as a decimal)
将数字格式化为小数，小数点后指定位数。位数必须是非负整数，如果位置太多结果是通过对数字进行四舍五入生成的；如果位置太少，则右侧补零。
是否为数字 (is a number)
如果给定对象是数字，...