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What does $$ mean in the shell?
... use a double dollar sign ( $$ ). This does produce a number that varies from time to time... but if you call it repeatedly, it returns the same number. (The solution is to just use the time.)
...
Using fonts with Rails asset pipeline
...nd all non-JS/CSS files (this will include all image assets automatically) from app/assets folders" (see here)
– Eric L.
Nov 6 '13 at 13:26
...
Apache shows PHP code instead of executing it
...php$>
SetHandler application/x-httpd-php
</FilesMatch>
Run this from the terminal:
sudo a2dismod mpm_event && sudo a2enmod mpm_prefork && sudo a2enmod php7
Then don't forget to restart Apache so it knows you changed stuff:
sudo service apache2 restart
This is a summa...
In JavaScript, why is “0” equal to false, but when tested by 'if' it is not false by itself?
...es which are equal when operands refer to the same object in memory.
(From Comparison Operators in Mozilla Developer Network)
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Remove all the children DOM elements in div
...M nodes (SVG, VML) or not (Silverlight, Flash, Canvas). Removing DOM nodes from DOM does not remove those JavaScript objects, and it does not remove DOM nodes either because JavaScript objects still have references to those DOM nodes. The correct way to handle this situation is described in my answe...
Why would iterating over a List be faster than indexing through it?
...m3 -> etc.
To access item3, you can see clearly that you need to walk from the head through every node until you reach item3, since you cannot jump directly.
Thus, if I wanted to print the value of each element, if I write this:
for(int i = 0; i < 4; i++) {
System.out.println(list.get(...
Passing arrays as parameters in bash
... --iread --msix --iwrite --msi --iread --msi --iwrite
Edit/notes: (from comments below)
descTable and optsTable are passed as names and are expanded in the function. Thus no $ is needed when given as parameters.
Note that this still works even with descTable etc being defined with local, b...
What command opens Ruby's REPL?
...ram named irb, but since it is just a Ruby library, it can also be invoked from Ruby code and not just from the shell. On Rubinius, IRb can also be invoked by just calling the rbx program without arguments, just like in CPython.
There is also a very nice REPL called Pry, which installs a program na...
Pandas: Setting no. of max rows
...y').
You can set an option only temporarily for this one time like this:
from IPython.display import display
with pd.option_context('display.max_rows', 100, 'display.max_columns', 10):
display(df) #need display to show the dataframe when using with in jupyter
#some pandas stuff
You can a...
What does the servlet value signify
... our application we are having a few servlets defined. Here is the excerpt from the web.xml for one of the servlets:
11 A...