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Dependency injection through constructors or property setters?
...more for unit tests, so now I am playing the game of going around altering all the constructors to match, and it's taking ages.
It makes me think that using properties with setters is a better way of getting dependencies. I don't think injected dependencies should be part of the interface to const...
How and/or why is merging in Git better than in SVN?
...ne, is much better merging than in traditional tools like SVN.
Is this actually due to inherent differences in how the two systems work, or do specific DVCS implementations like Git/Mercurial just have cleverer merging algorithms than SVN?
...
Why is lazy evaluation useful?
...epending on the sequence of conditional expressions, only a subset may actually be used. In a language like C, all three values would be computed anyway; but in Haskell, only the necessary values are computed.
It also allows for cool stuff like infinite lists. I can't have an infinite list in a lan...
Java: recommended solution for deep cloning/copying an instance
...t hierarchy):
commons-lang SerializationUtils - using serialization - if all classes are in your control and you can force implementing Serializable.
Java Deep Cloning Library - using reflection - in cases when the classes or the objects you want to clone are out of your control (a 3rd party libra...
Overriding id on create in ActiveRecord
...why you can't use mass-assignment to set it. However, when setting it manually, it just works:
o = SomeObject.new
o.id = 8888
o.save!
o.reload.id # => 8888
I'm not sure what the original motivation was, but I do this when converting ActiveHash models to ActiveRecord. ActiveHash allows you to...
Is std::vector so much slower than plain arrays?
...d the array only once. Note: when you resize() the vector you are not only allocating the memory but also running through the vector and calling the constructor on each member.
Re-Arranging the code slightly so that the vector only initializes each object once:
std::vector<Pixel> pixels(di...
Is the ternary operator faster than an “if” condition in Java [duplicate]
...one to " if-conditional syndrome " which means I tend to use if conditions all the time. I rarely ever use the ternary operator. For instance:
...
How do you find the disk size of a Postgres / PostgreSQL table and its indexes
... and index size in terms of bytes/MB/GB/etc , or even better the size for all tables. In Oracle I had a nasty long query that looked at user_lobs and user_segments to give back an answer.
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How to view file history in Git?
.....b410 path/to/file/a path/to/file/b
If you want to get an overview over all the differences that happened from commit to commit, use git log or git whatchanged with the patch option:
# include patch displays in the commit history
git log -p
git whatchanged -p
# only get history of those commits ...
Resolve promises one after another (i.e. in sequence)?
...uential manner. readFiles returns a promise, which is resolved only once all files have been read in sequence.
27 Answers...