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What is the difference between gsub and sub methods for Ruby Strings
...u that it is not obvious! Java calls these replace and replaceAll. But Ruby has its roots in Perl which uses the g modifier. It's just one of those things.
– Ray Toal
Jul 21 '11 at 0:27
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Difference between scaling horizontally and vertically for databases [closed]
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Horizontal scaling means that you scale by adding more machines into your pool of resources whereas Vertical scaling means that you scale by adding more power (CPU, RAM) to an existing machine.
An easy way to remember this is to think of a machine on a server rack,...
Bootstrap css hides portion of container below navbar navbar-fixed-top
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This is handled by adding some padding to the top of the <body>.
As per Bootstrap's documentation on .navbar-fixed-top, try out your own values or use our snippet below. Tip: By default, the navbar is 50px high.
body {
padding-...
psycopg2: insert multiple rows with one query
...s the following error: [TypeError: sequence item 0: expected str instance, bytes found] run this command instead [args_str = ','.join(cur.mogrify("(%s,%s)", x).decode("utf-8") for x in tup)]
– mrt
Sep 3 '18 at 23:08
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Maven is not working in Java 8 when Javadoc tags are incomplete
...n a way that is easily linked back to the
source code.
This is enabled by default, and will run a whole lot of checks before generating Javadocs. You need to turn this off for Java 8 as specified in this thread. You'll have to add this to your maven configuration:
<profiles>
<profile...
what is the difference between ?:, ?! and ?= in regex?
...d
Let's apply q(?=u)i to quit. The lookahead is positive and is followed by another token. Again, q matches q and u matches u. Again, the match from the lookahead must be discarded, so the engine steps back from i in the string to u. The lookahead was successful, so the engine continues with i. Bu...
Best way to split string into lines
...s ugly, just remove the unnecessary ToCharArray call.
If you want to split by either \n or \r, you've got two options:
Use an array literal – but this will give you empty lines for Windows-style line endings \r\n:
var result = text.Split(new [] { '\r', '\n' });
Use a regular expression, as in...
Install a module using pip for specific python version
On Ubuntu 10.04 by default Python 2.6 is installed, then I have installed Python 2.7. How can I use pip install to install packages for Python 2.7.
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Android Studio Editor Font Sizing
...e 'Appearance Settings') check the CheckBox called "Override default fonts by (not recommended)" and then the "Size" choice will un-grey and you can choose a new size using either the PullDown or by typing a number. Double check that the number is reasonable (not too large).
Click [Apply] to see th...
Return value in a Bash function
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$(...) captures the text sent to stdout by the command contained within. return does not output to stdout. $? contains the result code of the last command.
fun1 (){
return 34
}
fun2 (){
fun1
local res=$?
echo $res
}
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