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Is there any difference between the `:key => “value”` and `key: “value”` hash notations?
...ing that matches /\A[a-z_]\w*\z/i, AFAIK the parser uses its label pattern for these keys).
The :$in style symbols show up a fair bit when using MongoDB so you'll end up mixing Hash styles if you use MongoDB. And, if you ever work with specific keys of Hashes (h[:k]) rather than just whole hashes (...
Types in Objective-C on iOS
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Updated for 64 bit process
– jjxtra
Dec 21 '13 at 0:33
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Explicitly calling a default method in Java
... access the default versions in other methods in your implementing class.
Formal description of the method invocation syntax can be found in the chapter 15 of the JLS.
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Difference: std::runtime_error vs std::exception()
...een std::runtime_error and std::exception ? What is the appropriate use for each? Why are they different in the first place?
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When to use os.name, sys.platform, or platform.system?
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Dived a bit into the source code.
The output of sys.platform and os.name are determined at compile time. platform.system() determines the system type at run time.
sys.platform is specified as a compiler define during the build configuration.
os.name checks whether certain os spe...
Format a date using the new date time API
...e represents just a date, not a DateTime. So "HH:mm:ss" make no sense when formatting a LocalDate. Use a LocalDateTime instead, assuming you want to represent both a date and time.
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Why can't non-default arguments follow default arguments?
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All required parameters must be placed before any default arguments. Simply because they are mandatory, whereas default arguments are not. Syntactically, it would be impossible for the interpreter to decide which values match which arguments if mixed modes were allo...
What does the line “#!/bin/sh” mean in a UNIX shell script?
... the operating system will look at the first few bytes of the file. These form the so-called "magic number", which can be used to decide the format of the program and how to execute it.
#! corresponds to the magic number 0x2321 (look it up in an ascii table). When the system sees that the magic n...
Can I set a breakpoint on 'memory access' in GDB?
I am running an application through gdb and I want to set a breakpoint for any time a specific variable is accessed / changed. Is there a good method for doing this? I would also be interested in other ways to monitor a variable in C/C++ to see if/when it changes.
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How to define servlet filter order of execution using annotations in WAR
...ition, but just a <filter-mapping> definition in the desired order.
For example,
@WebFilter(filterName="filter1")
public class Filter1 implements Filter {}
@WebFilter(filterName="filter2")
public class Filter2 implements Filter {}
with in web.xml just this:
<filter-mapping>
<...