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What is the difference between null and undefined in JavaScript?
... want to know what the difference is between null and undefined in JavaScript.
33 Answers
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Search for one value in any column of any table inside a database
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I found a fairly robust solution at https://gallery.technet.microsoft.com/scriptcenter/c0c57332-8624-48c0-b4c3-5b31fe641c58 , which I thought was worth pointing out. It searches columns of these types: varchar, char, nvarchar, nchar, text. It works great and supports specific table-searching as w...
What is the proper way to use the node.js postgresql module?
...hen opening up a 1-off client to kill some
hung stuff or in command line scripts.
One very helpful thing is to centralize all access to your database in your app to one file. Don't litter pg.connect calls or new clients throughout. Have a file like db.js that looks something like this:
module....
What is the difference between application server and web server?
...d to serve static content, though most Web Servers have plugins to support scripting languages like Perl, PHP, ASP, JSP etc. through which these servers can generate dynamic HTTP content.
Most of the application servers have Web Server as integral part of them, that means App Server can do whatever...
Case insensitive searching in Oracle
...e outside of SQLPLUS, like in the shell environment. For example in a Perl script using DBD::Oracle, you can write $ENV{NLS_SORT} = 'BINARY_CI'; $ENV{NLS_COMP} = 'LINGUISTIC'; before calling ` DBI->connect`.
– mivk
Feb 8 '17 at 12:22
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An “and” operator for an “if” statement in Bash
I'm trying to create a simple Bash script to check if the website is down and for some reason the "and" operator doesn't work:
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Practical non-image based CAPTCHA approaches?
...Overflow. This is necessary to prevent bots, spammers, and other malicious scripted activity. We only want human beings to post or edit things here!
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Delete everything in a MongoDB database
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This script cleans everything within only one particular Mongo database. It erases all collections in this database.
– staskrak
Jun 17 '18 at 7:33
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How do I make a Mac Terminal pop-up/alert? Applescript?
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Use osascript. For example:
osascript -e 'tell app "Finder" to display dialog "Hello World"'
Replacing “Finder” with whatever app you desire. Note if that app is backgrounded, the dialog will appear in the background too. To...
Python Anaconda - How to Safely Uninstall
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The anaconda installer adds a line in your ~/.bash_profile script that prepends the anaconda bin directory to your $PATH environment variable. Deleting the anaconda directory should be all you need to do, but it's good housekeeping to remove this line from your setup script too.
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