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NSUserDefaults - How to tell if a key exists

...n't mind treating "not set" as if it were "set to zero". The people who already tested this appear to have been fooled by the false negative aspect, i.e. testing this by seeing if objectForKey returns nil when you know the key hasn't been set but failing to notice that it also returns nil if the ke...
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Calling JMX MBean method from a shell script

...on Jolokia as the bridge to JMX. Attributes and operations are exposed for reading and writing. http://code.google.com/p/jmxfuse/ For example, to read an attribute: me@oddjob:jmx$ cd log4j/root/attributes me@oddjob:jmx$ cat priority to write an attribute: me@oddjob:jmx$ echo "WARN" > priori...
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How to install ia32-libs in Ubuntu 14.04 LTS (Trusty Tahr)

...mpted to install three other packages: $ sudo apt-get install ia32-libs Reading package lists... Done Building dependency tree Reading state information... Done Package ia32-libs is not available, but is referred to by another package. This may mean that the package is missing, has...
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PHP convert date format dd/mm/yyyy => yyyy-mm-dd [duplicate]

... @agaggi That is only if you assume 100% of people reading this solution has the same situation as the OP! – Shadoweb Feb 21 '19 at 16:06 add a comment...
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Do I use , , or for SVG files?

...because it supports multiple backgrounds but not svg. An additional good read is this blogpost on svg fallbacks. share | improve this answer | follow | ...
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this.setState isn't merging states as I would expect

... @Madbreaks Ok, yes, upon re-reading the official docs I see that it is specified that you must use the function form of setState to reliably update state based on previous state. That said, I've never come across a problem to date if not trying to call...
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Is there an alternative to string.Replace that is case-insensitive?

...tion is actually much larger than the specific question being asked. After reading through, I'm not sure any answer is a few edits away from assimilating all the good stuff here, so I figured I'd try to sum. Here's an extension method that I think avoids the pitfalls mentioned here and provides the...
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What is the difference between concurrent programming and parallel programming?

... If you program is using threads (concurrent programming), it's not necessarily going to be executed as such (parallel execution), since it depends on whether the machine can handle several threads. Here's a visual example. Threads on a non-threaded m...
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How do you display code snippets in MS Word preserving format and syntax highlighting?

... This worked beautifully. I already had Notepad++ for other code projects, but never thought of using it. Combined with a Word style that added a faint blue background, border, and disabled spell check, it looks pretty good, and is fairly fast for a numbe...
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What is the difference between print and puts?

... puts adds a new line to the end of each argument if there is not one already. print does not add a new line. For example: puts [[1,2,3], [4,5,nil]] Would return: 1 2 3 4 5 Whereas print [[1,2,3], [4,5,nil]] would return: [[1,2,3], [4,5,nil]] Notice how puts does not output the nil va...