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What's the idiomatic syntax for prepending to a short python list?
... @MattM. If you insert at the front of a list, python has to move all the other items one space forwards, lists can't "make space at the front". collections.deque (double ended queue) has support for "making space at the front" and is much faster in this case.
– fejfo
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Rails 4: before_filter vs. before_action
...ller::Base, before_action is just a new syntax for before_filter.
However all before_filters syntax are deprecated in Rails 5.0 and will be removed in Rails 5.1
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Change one value based on another value in pandas
...', 'LastName']] = 'Matt', 'Jones'
Note that you'll need pandas version 0.11 or newer to make use of loc for overwrite assignment operations.
Another way to do it is to use what is called chained assignment. The behavior of this is less stable and so it is not considered the best solution (it is...
How to pass parameters to a partial view in ASP.NET MVC?
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Out of all the examples, this is the only one that fully worked for me. thanks
– BrianLegg
Nov 17 '15 at 21:05
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Can I list-initialize a vector of move-only type?
...nitializer list elements in the current revision of the language.
Specifically, we have:
typedef const E& reference;
typedef const E& const_reference;
typedef const E* iterator;
typedef const E* const_iterator;
const E* begin() const noexcept; // first element
const E* end() const noexce...
Node.js Mongoose.js string to ObjectId function
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answered Dec 5 '11 at 23:56
Kevin DenteKevin Dente
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Hidden Features of MySQL
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Since you put up a bounty, I'll share my hard won secrets...
In general, all the SQLs I tuned today required using sub-queries. Having come from Oracle database world, things I took for granted weren’t working the same with MySQL. And my reading on MySQL tuning makes me conclude that MySQL is be...
Instance v state variables in react.js
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Ross AllenRoss Allen
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Replace all whitespace characters
I want to replace all occurrences of white space characters (space, tab, newline) in JavaScript.
How to do so?
9 Answer...
What are paramorphisms?
...foldr c n xs)
para c n [] = n
foldr c n [] = n
Some people call paramorphisms "primitive recursion" by contrast with catamorphisms (foldr) being "iteration".
Where foldr's two parameters are given a recursively computed value for each recursive subobject of the input data (here, that...