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How to initialize an array in one step using Ruby?
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Plus one for the detailed answer, even though I prefer splat over to_a ([*'1'..'3']).
– Michael Kohl
Feb 5 '11 at 17:48
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Proper Linq where clauses
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The second one would be more efficient as it just has one predicate to evaluate against each item in the collection where as in the first one, it's applying the first predicate to all items first and the result (which is narrowed down a...
Difference between array_push() and $array[] =
...'m pretty sure there is a function behind the alternate syntax its not the one mentioned above as I see the fallowing comment in the php documentation: "If you use array_push() to add one element to the array it's better to use $array[] = because in that way there is no overhead of calling a functio...
What is the “N+1 selects problem” in ORM (Object-Relational Mapping)?
...hip.
Now, let's say you need to iterate through all the cars, and for each one, print out a list of the wheels. The naive O/R implementation would do the following:
SELECT * FROM Cars;
And then for each Car:
SELECT * FROM Wheel WHERE CarId = ?
In other words, you have one select for the Cars, and ...
How to generate an entity-relationship (ER) diagram using Oracle SQL Developer
... Data Modeler → Import → Data Dictionary.
Select a DB connection (add one if none).
Click Next.
Check one or more schema names.
Click Next.
Check one or more objects to import.
Click Next.
Click Finish.
The ERD is displayed.
Export the diagram as follows:
Click File → Data Modeler → Pri...
How to find the lowest common ancestor of two nodes in any binary tree?
...ooking for the first element where the list differ, or the last element of one of the lists, whichever comes first.
This algorithm requires O(h) time where h is the height of the tree. In the worst case O(h) is equivalent to O(n), but if the tree is balanced, that is only O(log(n)). It also require...
What is your naming convention for stored procedures? [closed]
...pecially if there are a large amount of sprocs.
Regarding where more than one object is used, I find that most instances have a primary and secondary object, so the primary object is used in the normal instance, and the secondary is refered to in the process section, for example App_Product_AddAttr...
One-liner to recursively list directories in Ruby?
What is the fastest, most optimized, one-liner way to get an array of the directories (excluding files) in Ruby?
9 Answer...
Intersection of two lists in Bash
...ts found in two lists. To simplify, let's use ls as an example. Imagine "one" and "two" are directories.
6 Answers
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What is the difference between IEnumerator and IEnumerable? [duplicate]
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IEnumerable is an interface that defines one method GetEnumerator which returns an IEnumerator interface, this in turn allows readonly access to a collection. A collection that implements IEnumerable can be used with a foreach statement.
Definition
IEnumerable
p...