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How do you know when to use fold-left and when to use fold-right?
... (foldl and foldr take an external initial value), and Haskell's "cons" is called (:) not (::), but otherwise this is correct. You may want to add that Haskell additionally provides a foldl'/foldl1' which are strict variants of foldl/foldl1, because lazy arithmetic is not always desirable.
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Elastic search, multiple indexes vs one index and types for different data sets?
...our hardware.
If you are asking what is too much data vs small data? Typically it depends on the processor speed and the RAM of your hardware, the amount of data you store within each variable in your mapping for Elasticsearch and your query requirements; using many facets in your queries is going...
How do I find Waldo with Mathematica?
..., ZIP code readers, and strokeless handwriting recognition work today. Basically you know the answer is there, you know more or less what it should look like, and everything else may have common elements, but is definitely "not it", so you don't bother with the "not it"s, you just look of the likeli...
How do I pass a method as a parameter in Python
...think about a method (or function) as a variable whose value is the actual callable code object.
Since you asked about methods, I'm using methods in the following examples, but note that everything below applies identically to functions (except without the self parameter).
To call a passed method or...
Maximum size of an Array in Javascript
...round. I have one array to store data to display, and another which stores ID's of records that have been shown.
7 Answers
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What is the difference between “Class.forName()” and “Class.forName().newInstance()”?
... demo = (Demo) clazz.newInstance();
}
}
As explained in its javadoc, calling Class.forName(String) returns the Class object associated with the class or interface with the given string name i.e. it returns test.Demo.class which is affected to the clazz variable of type Class.
Then, calling cl...
What exactly are late static bindings in PHP?
...gs in the PHP manual. However, I'll try to give you a quick summary.
Basically, it boils down to the fact that the self keyword does not follow the same rules of inheritance. self always resolves to the class in which it is used. This means that if you make a method in a parent class and call it...
How do I use NSTimer?
...ntion to the Cocoa/CF documentation (which is always a great first port of call). The Apple docs have a section at the top of each reference article called "Companion Guides", which lists guides for the topic being documented (if any exist). For example, with NSTimer, the documentation lists two com...
Two inline-block, width 50% elements wrap to second line [duplicate]
I would like to have two columns of 50% width space, and avoid floats.
So i thought using display:inline-block .
5 Answers...
What's the best manner of implementing a social activity stream? [closed]
...stem and I took this approach:
Database table with the following columns: id, userId, type, data, time.
userId is the user who generated the activity
type is the type of the activity (i.e. Wrote blog post, added photo, commented on user's photo)
data is a serialized object with meta-data for the ...