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What is the !! (not not) operator in JavaScript?
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Converts Object to boolean. If it was falsey (e.g. 0, null, undefined, etc.), it will be false, otherwise, true.
!oObject // inverted boolean
!!oObject // non inverted boolean so true boolean representation
So !! is not an operator, it's just the ! ope...
How do I manage MongoDB connections in a Node.js web application?
I'm using the node-mongodb-native driver with MongoDB to write a website.
11 Answers
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How to enable C++11 in Qt Creator?
The title is pretty self-descriptive. I've downloaded Qt Creator 2.7.0, and I am trying to compile some basic C++11 code:
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Simulating ENTER keypress in bash script
...a few commands.
one of these commands needs user input during runtime. i.e it asks the user "do you want to blah blah blah?", I want to simply send an enter keypress to this so that the script will be completely automated.
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What is sr-only in Bootstrap 3?
What is the class sr-only used for? Is it important or can I remove it? Works fine without.
6 Answers
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How to urlencode data for curl command?
I am trying to write a bash script for testing that takes a parameter and sends it through curl to web site. I need to url encode the value to make sure that special characters are processed properly. What is the best way to do this?
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Mongoose's find method with $or condition does not work properly
Recently I start using MongoDB with Mongoose on Nodejs.
4 Answers
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PSQLException: current transaction is aborted, commands ignored until end of transaction block
...ne of your SQL Queries failed, and you gobbled up that failure and ignored it. But that wasn't enough, THEN you used that same connection, using the SAME TRANSACTION to run another query. The exception gets thrown on the second, correctly formed query because you are using a broken transaction to ...
How can I do test setup using the testing package in Go
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Starting with Go 1.4 you can implement setup/teardown (no need to copy your functions before/after each test). The documentation is outlined here in the Main section:
TestMain runs in the main goroutine and can do whatever setup an...
Close and Dispose - which to call?
...ering for classes such as SqlConnection or one of the several classes inheriting from the Stream class does it matter if I close Dispose rather than Close?
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