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Can every recursion be converted into iteration?
A reddit thread brought up an apparently interesting question:
17 Answers
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arrow operator (->) in function heading
...atter? Well, C++11 introduced this cool decltype thing that lets you describe type of an expression. So you might want to derive the return type from the argument types. So you try:
template <typename T1, typename T2>
decltype(a + b) compose(T1 a, T2 b);
and the compiler will tell you that ...
How to find encoding of a file via script on Linux?
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Sounds like you're looking for enca. It can guess and even convert between encodings. Just look at the man page.
Or, failing that, use file -i (linux) or file -I (osx). That will output MIME-type information for the file, which will also include the character-set encoding. I found a man-pag...
Why '&&' and not '&'?
Why is && preferable to & and || preferable to | ?
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Why doesn't await on Task.WhenAll throw an AggregateException?
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I don't exactly remember where, but I read somewhere that with new async/await keywords, they unwrap the AggregateException into the actual exception.
So, in catch block, you get the actual exception and not the aggregated one. This helps us writ...
Correct way to find max in an Array in Swift
I've so far got a simple (but potentially expensive) way:
12 Answers
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What is a “callable”?
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A callable is anything that can be called.
The built-in callable (PyCallable_Check in objects.c) checks if the argument is either:
an instance of a class with a __call__ method or
is of a type that has a non null tp_call (c stru...
Get all non-unique values (i.e.: duplicate/more than one occurrence) in an array
...the same as the current. Assuming your sort algorithm is good, this should be less than O(n2):
const findDuplicates = (arr) => {
let sorted_arr = arr.slice().sort(); // You can define the comparing function here.
// JS by default uses a crappy string compare.
// (we use slice to cl...
How to iterate over a JavaScript object?
I have an object in JavaScript:
18 Answers
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CSS3 Rotate Animation
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Here is a demo. The correct animation CSS:
.image {
position: absolute;
top: 50%;
left: 50%;
width: 120px;
height: 120px;
margin:-60px 0 0 -60px;
-webkit-animation:spin 4s linear infinite;
-moz-animation:spin 4s linear infinite;
animation:spin 4s l...