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Why use symbols as hash keys in Ruby?
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TL;DR:
Using symbols not only saves time when doing comparisons, but also saves memory, becau...
Return index of greatest value in an array
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Convert a string representation of a hex dump to a byte array using Java?
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24 Answers
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Count the number of occurrences of a string in a VARCHAR field?
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answered Sep 10 '12 at 2:56
yannisyannis
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Invalid date format specification in gemspec
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edited Feb 19 '12 at 21:27
answered Sep 3 '11 at 3:22
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Why isn't SQL ANSI-92 standard better adopted over ANSI-89?
...ere was no difference in optimization or performance of SQL-89 versus SQL-92 style joins. One can assume that most RDBMS engines transform the syntax into an internal representation before optimizing or executing the query, so the human-readable syntax makes no difference.
I also try to evangelize...
VS2013 permanent CPU usage even though in idle mode
I've recently updated VS2013 to Update 1 and since then VS takes CPU usage to 25% (on a 4 cores intel i5 cpu) permanently even though it's supposed to be idle. I thought it has some unfinished background processes so I left it running for a while but it keeps using the cpu when it's supposed to be i...
adding multiple entries to a HashMap at once in one statement
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You can use the Double Brace Initialization as shown below:
Map<String, Integer> hashMap...
Set environment variables from file of key/value pairs
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Python memoising/deferred lookup property decorator
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For all sorts of great utilities I'm using boltons.
As part of that library you have cachedprop...