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Why does Java's hashCode() in String use 31 as a multiplier?
... for 31 since 33 is not a prime:
Of the remaining
four, I'd probably select P(31), as it's the cheapest to calculate on a RISC
machine (because 31 is the difference of two powers of two). P(33) is
similarly cheap to calculate, but it's performance is marginally worse, and
33 is composit...
Using Git, show all commits that are in one branch, but not the other(s)
...h a diagram illustration https://git-scm.com/book/en/v2/Git-Tools-Revision-Selection#Commit-Ranges
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Entity Framework - Add Navigation Property Manually
...also make sure that you get your Primary Key definition right (right click select related fields, mark them as EntityKey in the properties). Otherwise you might get 'Multiplicity is not valid in Role in relationship Because the Dependent Role refers to the key properties...'
– ...
Installing Java on OS X 10.9 (Mavericks)
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If you have installed both java6 and java7, you can select v6 in your shell with: export JAVA_HOME=/System/Library/Java/JavaVirtualMachines/1.6.0.jdk/Contents/Home
– Jürgen Strobel
Oct 28 '13 at 13:34
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UML class diagram enum
...using ArgoEclipse or ArgoUML, there's a pulldown menu on the toolbar which selects among Datatype, Enumeration, Signal, etc that will allow you to create your own Enumerations. The compartment that normally contains Attributes can then be populated with EnumerationLiterals for the values of your en...
Do I need to disable NSLog before release Application?
...s is through 'edit scheme' -> 'run app name' -> under the tab 'info' select using the drop-down box between debug & release. In the release version you won't see any NSLog output in the debug console !
How does this all work?
first of all, one must know that a preprocessor is relatively ...
Inheriting constructors
... constructors, if you write this, you inherit all of them. To inherit only selected ones you need to write the individual constructors manually and call the base constructor as needed from them.
Historically constructors could not be inherited in the C++03 standard. You needed to inherit them manua...
How accurate is python's time.sleep()?
...ailable), and sleep() will
accept a time with a nonzero fraction
(Unix select is used to implement
this, where available).
And more specifically w.r.t. sleep():
Suspend execution for the given number
of seconds. The argument may be a
floating point number to indicate a
more precise...
How can I get selector from jQuery object
Is there an easy way to get selector from $(this) ? There is a way to select an element by its selector, but what about getting the selector from element ?
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git log of a single revision
...grep='part_of_description' -p
where git log --grep='part_of_description' select the commits that contains 'part_of_description' and -p show the changeset of each commit
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