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How do I use itertools.groupby()?
...understandable explanation of how to actually use Python's itertools.groupby() function. What I'm trying to do is this:
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Append an object to a list in R in amortized constant time, O(1)?
...h birthday. Some kind readers keep repeating any shortcomings with it, so by all means also see some of the comments below. One suggestion for list types:
newlist <- list(oldlist, list(someobj))
In general, R types can make it hard to have one and just one idiom for all types and uses.
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C# Linq Group By on multiple columns [duplicate]
...es above, I would like to use LINQ to create a List from the List, grouped by the School, Friend and FavoriteColor properties. Is this possible with LINQ?
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Best practice for instantiating a new Android Fragment
... to your Fragment so that they are available after a Fragment is recreated by Android is to pass a bundle to the setArguments method.
So, for example, if we wanted to pass an integer to the fragment we would use something like:
public static MyFragment newInstance(int someInt) {
MyFragment myF...
Greedy vs. Reluctant vs. Possessive Quantifiers
... [xyz]*foo, there's no way that backtracking the x's, y's, and z's matched by the [xyz]* bit will ever allow the following foo bit to match, so you can speed things up by making it possessive.
– Anomie
Nov 23 '16 at 12:29
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Difference between shared objects (.so), static libraries (.a), and DLL's (.so)?
...ons within a ".so" file, and some don't have to do that at all? Thank you, by the way!
– Cloud
Mar 13 '12 at 16:47
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Use of 'const' for function parameters
...s nothing to do there but it can be found there in a long function written by more than one programmer over a long period of time. I would strongly suggest to write int getDouble( const int a ){ //... } that will generate a compile error when finding ++a;.
– dom_beau
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How to solve “Plugin execution not covered by lifecycle configuration” for Spring Data Maven Builds
I am trying to work with Spring Data and Neo4j . I started by trying to follow this guide linked to by the main site. In particular I based my pom.xml off of the "Hello, World!" example file . Here is a snip from my pom.xml for the plugin that is causing the issues...
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@property retain, assign, copy, nonatomic in Objective-C
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The article linked to by MrMage is no longer working. So, here is what I've learned in my (very) short time coding in Objective-C:
nonatomic vs. atomic
- "atomic" is the default. Always use "nonatomic". I don't know why, but the book I read said ...
What does it mean to start a PHP function with an ampersand?
... will return a reference to a variable instead of the value.
Returning by reference is useful when
you want to use a function to find to
which variable a reference should be
bound. Do not use return-by-reference
to increase performance. The engine
will automatically optimize this on
...