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What is Weak Head Normal Form?
... further (i.e. it contains no un-evaluated thunks).
These expressions are all in normal form:
42
(2, "hello")
\x -> (x + 1)
These expressions are not in normal form:
1 + 2 -- we could evaluate this to 3
(\x -> x + 1) 2 -- we could apply the function
"he" ++ "llo" ...
Is it safe to resolve a promise multiple times?
... rejected), that is it for a defered object - it is done.
If you should call then(...) on it's promise again, you should immediately get the (first) resolved/rejected result.
Additional calls to resolve() will not (should not?) have any effect. Not sure what happens if you attempt to reject a de...
Understanding NSRunLoop
... run loop directly, though there are some (networking) components that may allow you to specify which run loop they will use for I/O processing.
A run loop for a given thread will wait until one or more of its input sources has some data or event, then fire the appropriate input handler(s) to proce...
How do you implement a class in C? [closed]
...se C (no C++ or object oriented compilers) and I don't have dynamic memory allocation, what are some techniques I can use to implement a class, or a good approximation of a class? Is it always a good idea to isolate the "class" to a separate file? Assume that we can preallocate the memory by assumin...
How to remove a field from params[:something]
... = params.except[the one I wish to remove]
This is a safer way to 'grab' all the params you need into a copy WITHOUT destroying the original passed in params (which is NOT a good thing to do as it will make debugging and maintenance of your code very hard over time).
Or you could just pass direc...
Understand the “Decorator Pattern” with a real world example
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Decorator pattern achieves a single objective of dynamically adding
responsibilities to any object.
Consider a case of a pizza shop. In the pizza shop they will sell few pizza varieties and they will also provide toppings in the menu. Now imagine a situation wherein if the piz...
Recent file history in Vim?
...
:e #<1 opens last file, see :h c_#<.
– Hotschke
Dec 15 '15 at 16:42
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ImportError: No module named pip
...
After installing ez_setup, you should have easy_install available. To install pip just do:
easy_install pip
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get UTC time in PHP
...i: a Unix timestamp is by definition always UTC. en.wikipedia.org/wiki/Unix_time
– nikc.org
Jul 20 '15 at 8:20
1
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get dictionary value by key
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It's as simple as this:
String xmlfile = Data_Array["XML_File"];
Note that if the dictionary doesn't have a key that equals "XML_File", that code will throw an exception. If you want to check first, you can use TryGetValue like this:
string xmlfile;
if (!Data_Array.T...