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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...
How to make a promise from setTimeout
...ertain contexts), I'm going to use later as the name of the function to avoid confusion.
Basic Delay
Using native promises (or a faithful polyfill) it would look like this:
function later(delay) {
return new Promise(function(resolve) {
setTimeout(resolve, delay);
});
}
Note that...
What is the apply function in Scala?
...t works the other way too - every object can be treated as a function, provided it has the apply method. Such objects can be used in the function notation:
// we will be able to use this object as a function, as well as an object
object Foo {
var y = 5
def apply (x: Int) = x + y
}
Foo (1) // ...
How much overhead does SSL impose?
...ting a single byte at a time, which is the worst case. Never seen 250x. I did an extensive experiment over the Internet with 1700 data points where the general result was that plaintext sockets were no better than three times as fast as SSL, using programming no more sophisticated than buffering and...
What is a bank conflict? (Doing Cuda/OpenCL programming)
I have been reading the programming guide for CUDA and OpenCL, and I cannot figure out what a bank conflict is. They just sort of dive into how to solve the problem without elaborating on the subject itself. Can anybody help me understand it? I have no preference if the help is in the context of CUD...
JavaScript DOM remove element
...d(child);
In your example, you should be doing something like:
if (frameid) {
frameid.parentNode.removeChild(frameid);
}
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