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Why does direction of index matter in MongoDB?
...se together in descending order.
When you have a compound key - The order starts to matter.
For example, if the key is A ascending B ascending the index might look something like this:
Row A B
1 1 1
2 2 6
3 2 7
4 3 4
5 3 5
6 3 6
7 5 1
A query for A ascending B de...
How do API Keys and Secret Keys work? Would it be secure if I have to pass my API and secret keys to
I am just starting to think about how api keys and secret keys work. Just 2 days ago I signed up for Amazon S3 and installed the S3Fox Plugin . They asked me for both my Access Key and Secret Access Key, both of which require me to login to access.
...
Declaring variables inside loops, good practice or bad practice?
...s no longer in scope.
I don't know if you realize (I didn't when I first started programming), that brackets (as long they are in pairs) can be placed anywhere within the code, not just after "if", "for", "while", etc.
My code compiled in Microsoft Visual C++ 2010 Express, so I know it works; als...
Exploitable PHP functions
...ed.
Function => Position of callback arguments
'ob_start' => 0,
'array_diff_uassoc' => -1,
'array_diff_ukey' => -1,
'array_filter' => 1,
'array_intersect_uassoc' => -1,
'array_intersect_ukey' =>...
“To Do” list before publishing Android app to market [closed]
...scription) in your app -> you will get more 5 stars (usually a popup on startup, or after a feature action).
Consider explaining your product via a "Tips" or "Instructions" section in your app.
Save your keystore and credentials information somewhere safe. You won't be able to publish an update f...
What methods of ‘clearfix’ can I use?
...for IE 6/7 …on purpose!
Thierry also offers: "A word of caution: if you start a new project from scratch, go for it, but don’t swap this technique with the one you have now, because even though you do not support oldIE, your existing rules prevent collapsing margins."
Micro Clearfix
The mos...
Does functional programming replace GoF design patterns?
Since I started learning F# and OCaml last year, I've read a huge number of articles which insist that design patterns (especially in Java) are workarounds for the missing features in imperative languages. One article I found makes a fairly strong claim :
...
How to put the legend out of the plot
... try playing around with placing the legend in different places:
So, let's start with a generic example:
import matplotlib.pyplot as plt
import numpy as np
x = np.arange(10)
fig = plt.figure()
ax = plt.subplot(111)
for i in xrange(5):
ax.plot(x, i * x, label='$y = %ix$' % i)
ax.legend()
plt...
Difference between std::system_clock and std::steady_clock?
...
Maybe, the most significant difference is the fact that the starting point of std::chrono:system_clock is the 1.1.1970, so-called UNIX-epoch.
On the other side, for std::chrono::steady_clock typically the boot time of your PC and it's most suitable for measuring intervals.
...
CSS: fixed position on x-axis but not y?
... for the answer.
The easiest way to understand how DNA is organized is to start with its basic building blocks. DNA consists of four different sugars that interact with each other in specific ways. These four sugars are called nucleotide bases and have the names adenine (A), thymine (T), cytosine (...