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Can Java 8 code be compiled to run on Java 7 JVM?
...ava 8 features in the code I write for quite some time, since I want to avoid people having to upgrade their local Java installation.
– JesperE
Aug 15 '14 at 10:05
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Usage of EnsureSuccessStatusCode and handling of HttpRequestException it throws
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The idiomatic usage of EnsureSuccessStatusCode is to concisely verify success of a request, when you don't want to handle failure cases in any specific way. This is especially useful when you want to quickly prototype a client.
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List comprehension rebinds names even after scope of comprehension. Is this right?
... leak the loop control variable in Python 2 but not in Python 3. Here's Guido van Rossum (creator of Python) explaining the history behind this:
We also made another change in Python
3, to improve equivalence between list
comprehensions and generator
expressions. In Python 2, the list
c...
Enabling ProGuard in Eclipse for Android
The new documentation on ProGuard for Android says to add a line to the default.properties file in the project home directory. However, on opening this file, I read at the top:
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Final arguments in interface methods - what's the point?
... as useful documentation that its value
will not change and can help avoid
programming errors.
However, a final modifier on a method parameter is not mentioned in the rules for matching signatures of overridden methods, and it has no effect on the caller, only within the body of an implementa...
Count, size, length…too many choices in Ruby?
...; [1,2,3].count{|x| x > 2 }
=> 1
In the case where you don't provide a parameter to count it has basically the same effect as calling length. There can be a performance difference though.
We can see from the source code for Array that they do almost exactly the same thing. Here is the C c...
Using mixins vs components for code reuse in Facebook React
...osition
At first, I tried to use subcomponents for this and extract FormWidget and InputWidget. However, I abandoned this approach halfway because I wanted a better control over generated inputs and their state.
Two articles that helped me most:
Thinking in React made me realize I don't actua...
std::next_permutation Implementation Explanation
...ented so I extracted the the gnu libstdc++ 4.7 version and sanitized the identifiers and formatting to produce the following demo...
...
How can you debug a CORS request with cURL?
...ng --head outputs only headers. Second when testing S3 URLs we need to provide additional header -H "Access-Control-Request-Method: GET".
Hope this will save time.
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How can I use a Python script in the command line without cd-ing to its directory? Is it the PYTHONP
...ctories are silently ignored.
In addition to normal directories, individual PYTHONPATH entries may
refer to zipfiles containing pure Python modules (in either source or
compiled form). Extension modules cannot be imported from zipfiles.
The default search path is installation dependent...