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How to join (merge) data frames (inner, outer, left, right)
...rge; it's safer if the input data.frames change unexpectedly and easier to read later on.
You can merge on multiple columns by giving by a vector, e.g., by = c("CustomerId", "OrderId").
If the column names to merge on are not the same, you can specify, e.g., by.x = "CustomerId_in_df1", by.y = "Cu...
Why does sun.misc.Unsafe exist, and how can it be used in the real world?
...eal JNI calls into native code that contains special instructions for CAS
read more about CAS here http://en.wikipedia.org/wiki/Compare-and-swap
The sun.misc.Unsafe functionality of the host VM can be used to allocate uninitialized objects and then interpret the constructor invocation as any other ...
Search for executable files using find command
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Indeed, I misread your answer. Sorry for making it more complicated :).
– sourcejedi
Jul 19 '14 at 15:30
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Generic type parameter naming convention for Java (with multiple chars)?
...generic type parameters with more than one character to make the code more readable.
5 Answers
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Create a custom View by inflating a layout?
...r your components in code (TextView, etc), and in your constructor you can read the attributes passed in from the XML. You can then pass that attribute to your title TextView.
http://developer.android.com/guide/topics/ui/custom-components.html
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Find a class somewhere inside dozens of JAR files?
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A syntax variation:
find path/to/libs -name '*.jar' -print | \
while read i; do jar -tvf "$i" | grep -Hsi ClassName && echo "$i"; done
Windows
Open a command prompt, change to the directory (or ancestor directory) containing the JAR files, then:
for /R %G in (*.jar) do @jar -tvf "...
Entity Framework and Connection Pooling
...off connnection pooling in connection string if you don't want to use it. (read more about SQL Server Connection Pooling (ADO.NET))
Never ever use global context. ObjectContext internally implements several patterns including Identity Map and Unit of Work. Impact of using global context is different...
Image width/height as an attribute or in CSS? [duplicate]
...ore doesn't require the alt attribute. I'm fairly certain that most screen readers would not even know that a CSS image exists.
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React.js: onChange event for contentEditable
... @SebastienLorber not very optimized, but I'm pretty sure it's better to read the html, than to set it. The only other option I can think of is to listen to all events that could change the html, and when those happen you cache the html. That'd probably be faster most of the time, but add a lot ...
Do you have to put Task.Run in a method to make it async?
...synchronous" (async) means that it may yield control back to the calling thread before it starts. In an async method, those "yield" points are await expressions.
This is very different than the term "asynchronous", as (mis)used by the MSDN documentation for years to mean "executes on a background t...