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How to use Active Support core extensions
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if you need this all the time - let say you are playing with some code or something, you can add or modify .irbrc file to require all libs that you use all the time. It will load them automatically on start. I.E. I use awesome_print, hirb and some cu...
Benefits of EBS vs. instance-store (and vice-versa) [closed]
...e at Amazon you were running on gets flaky or dies, which does happen from time to time)
It is faster to launch an EBS backed instance because the image does not have to be fetched from S3.
If the hardware your EBS-backed instance is scheduled for maintenance, stopping and starting the instance auto...
How to see if an NSString starts with a certain other string?
I am trying to check to see if a string that I am going to use as URL starts with http. The way I am trying to check right now doesn't seem to be working. Here is my code:
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jQuery: Best practice to populate drop down?
The example I see posted all of the time seems like it's suboptimal, because it involves concatenating strings, which seems so not jQuery. It usually looks like this:
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How to create a temporary directory?
I use to create a tempfile , delete it and recreate it as a directory:
4 Answers
4
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How to write LaTeX in IPython Notebook?
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\begin{align}
\nabla \cdot \vec{\mathbf{E}} & = 4 \pi \rho \\
\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t} & = \vec{\mathbf{0}} \\
\nabla \cdot \vec{\mathbf{B}} & = 0
\end{align}
Math object to pass in a raw LaTeX string:
from IPython.dis...
How to invoke a Linux shell command from Java
I am trying to execute some Linux commands from Java using redirection (>&) and pipes (|). How can Java invoke csh or bash commands?
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Example for sync.WaitGroup correct?
...ointless to call wg.Add over and over again when you already know how many times it will be called.
Waitgroups panic if the counter falls below zero. The counter starts at zero, each Done() is a -1 and each Add() depends on the parameter. So, to ensure that the counter never drops below and avoid...
How Many Seconds Between Two Dates?
... 0, 0, 0, 0);
var t2 = new Date(ZZZZ, NN, EE, 0, 0, 0, 0);
var dif = t1.getTime() - t2.getTime();
var Seconds_from_T1_to_T2 = dif / 1000;
var Seconds_Between_Dates = Math.abs(Seconds_from_T1_to_T2);
A handy source for future reference is the MDN site
Alternatively, if your dates come in a format...
What is the difference between currying and partial application?
I quite often see on the Internet various complaints that other peoples examples of currying are not currying, but are actually just partial application.
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