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How do I get around type erasure on Scala? Or, why can't I get the type parameter of my collections?
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This answer uses the Manifest-API, which is deprecated as of Scala 2.10. Please see answers below for more current solutions.
Scala was defined with Type Erasure because the Java Virtual Machine (JVM), unlike Java, did not get generics. This means that, ...
How do I handle too long index names in a Ruby on Rails ActiveRecord migration?
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According to APIdock the name has to be a string, not a symbol
– Jaco Pretorius
Dec 31 '13 at 14:38
7
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What is the relationship between Looper, Handler and MessageQueue in Android?
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@Jack - They are the same thing. The Android API docs for MessageQueue state that a MessageQueue is a "low-level class holding the list of messages to be dispatched by a Looper."
– Ted Hopp
Jan 3 '18 at 15:12
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NUnit Unit tests not showing in Test Explorer with Test Adapter installed
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Using NuGet you'll have access to the api of nunit. Using this way you'll be able to run the tests on the Test Explorer (by default it runs only the MS Test).
– Ricardo França
Jan 4 '18 at 17:55
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How to check whether a pandas DataFrame is empty?
...dex:
if len(df.columns) == 0: 1
Reason:
According to the Pandas Reference API, there is a distinction between:
an empty dataframe with 0 rows and 0 columns
an empty dataframe with rows containing NaN hence at least 1 column
Arguably, they are not the same. The other answers are imprecise in that ...
Split Java String by New Line
...tion "Backslashes, escapes, and quoting" docs.oracle.com/javase/1.4.2/docs/api/java/util/regex/…
– angryITguy
Dec 5 '11 at 22:09
7
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Different between parseInt() and valueOf() in java?
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Well, the API for Integer.valueOf(String) does indeed say that the String is interpreted exactly as if it were given to Integer.parseInt(String). However, valueOf(String) returns a new Integer() object whereas parseInt(String) returns ...
jquery .html() vs .append()
...ed in a reference for the jquery syntax used above and what is allowed see api.jquery.com/jquery/#jQuery-html-attributes.
– Thaddeus Albers
May 29 '14 at 21:38
1
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What is the best way to filter a Java Collection?
...vice.isAuthorized(u);
return isAuthorized;
}).findFirst();
The JDK 8 API for optionals has the ability to get(), isPresent(), orElse(defaultUser), orElseGet(userSupplier) and orElseThrow(exceptionSupplier), as well as other 'monadic' functions such as map, flatMap and filter.
If you want to s...
Avoiding SQL injection without parameters
...perhaps saving the server a step when running the query.
Additionally, escaping single quotes isn't good enough. Many DB products allow alternate methods for escaping characters that an attacker could take advantage of. In MySQL, for example, you can also escape a single quote with a backslash. ...