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What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...ave a lot of quotes in your string these alternative forms can get hard to read (and therefore hard to maintain). This page provides a good introduction to quoting in Bash.
Arrays ($var vs. $var[@] vs. ${var[@]})
Now for your array. According to the bash manual:
Referencing an array variable w...
How do I analyze a program's core dump file with GDB when it has command-line parameters?
...tput warning: core file may not match specified executable file. Failed to read a valid object file image from memory.
– Treper
Nov 29 '11 at 5:07
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How to prevent a click on a '#' link from jumping to top of page?
..., do an event.preventDefault(). This is more clear for the people who will read your code.
– RvdK
Jul 15 '10 at 6:06
@...
Receive JSON POST with PHP
...
If you already have your parameters set like $_POST['eg'] for example and you don't wish to change it, simply do it like this:
$_POST = json_decode(file_get_contents('php://input'), true);
This will save you the hassle of changing ...
How many bytes in a JavaScript string?
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My reading of that passage doesn't imply implementation independence.
– Paul Biggar
Feb 8 '10 at 4:59
4
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Adding elements to object
... brackets [] are used to access the property. Test it here on jsfiddle and read about it here at Mozilla and here's a great article at Digital Ocean that I wish I came across long ago.
– Hastig Zusammenstellen
Aug 27 '18 at 7:33
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C state-machine design [closed]
...am building one small-ish state-machine at the heart of one of my worker thread.
27 Answers
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How to UPSERT (MERGE, INSERT … ON DUPLICATE UPDATE) in PostgreSQL?
...e.
If you're on 9.5 and don't need to be backward-compatible you can stop reading now.
9.4 and older:
PostgreSQL doesn't have any built-in UPSERT (or MERGE) facility, and doing it efficiently in the face of concurrent use is very difficult.
This article discusses the problem in useful detail.
In g...
Getting new Twitter API consumer and secret keys
...
Log into the Twitter Developers section.
If you don't already have an account, you can login with your normal Twitter credentials
Go to "Create an app"
Fill in the details of the application you'll be using to connect with the API
Your application name must be unique. If someon...
String comparison in Python: is vs. == [duplicate]
...ed. The statement
if x is y then x==y is also True
should never be read to mean
if x==y then x is y
It is a logical error on the part of the reader to assume that the converse of a logic statement is true. See http://en.wikipedia.org/wiki/Converse_(logic)
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