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Is There a Better Way of Checking Nil or Length == 0 of a String in Ruby?
...rried about performance, I'll often use this:
if my_string.to_s == ''
# It's nil or empty
end
There are various variations, of course...
if my_string.to_s.strip.length == 0
# It's nil, empty, or just whitespace
end
...
JPA and Hibernate - Criteria vs. JPQL or HQL
What are the pros and cons of using Criteria or HQL ? The Criteria API is a nice object-oriented way to express queries in Hibernate, but sometimes Criteria Queries are more difficult to understand/build than HQL.
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How do I show multiple recaptchas on a single page?
...out doing this on an ASP page (link) and the consensus over there was that it was not possible to do with recaptcha. It seems that multiple forms on a single page must share the captcha, unless you're willing to use a different captcha. If you are not locked into recaptcha a good library to take a l...
How do I check if a string is valid JSON in Python?
..., is there a way to check if a string is valid JSON before trying to parse it?
4 Answers
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SQL how to increase or decrease one for a int column in one command
I have an Orders table which has a Quantity column. During check in or check out, we need to update that Quantity column by one. Is there a way to do this in one action or we have to get the existing value and then add or minus one on top of it?
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Detect if called through require or directly by command line
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edited Feb 19 '19 at 15:50
Christopher McCormack
7344 bronze badges
answered Jun...
How to place div side by side
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edited Sep 16 at 15:15
NearHuscarl
3,18022 gold badges1111 silver badges3636 bronze badges
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How can I scan barcodes on iOS?
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We produced the 'Barcodes' application for the iPhone. It can decode QR Codes. The source code is available from the zxing project; specifically, you want to take a look at the iPhone client and the partial C++ port of the core library. The port is a little old, from circa the 0....
package R does not exist
I'm getting the dreaded package R does not exist, it's killing me.
The code is fine I have apps in the market running the code.
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Parallelize Bash script with maximum number of processes
...ng on what you want to do xargs also can help (here: converting documents with pdf2ps):
cpus=$( ls -d /sys/devices/system/cpu/cpu[[:digit:]]* | wc -w )
find . -name \*.pdf | xargs --max-args=1 --max-procs=$cpus pdf2ps
From the docs:
--max-procs=max-procs
-P max-procs
Run up to max-procs...