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NSDictionary - Need to check whether dictionary contains key-value pair or not
... @jbx72487 Dictionaries must contain objects; objectForKey: returns an id -- a pointer to an Objective-C object. If you are storing numbers, they must be "boxed" into an NSNumber. Even if the NSNumber is zero or false it will be still be a valid pointer and the above code will accurately detect ...
Why use jQuery on() instead of click()
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Because you might have a dynamically generated elements (for example coming from an AJAX call), you might want to have the same click handler that was previously bound to the same element selector, you then "delegate" the click event using on() with select...
How can I create directory tree in C++/Linux?
... top-down to ensure
** each directory in path exists, rather than optimistically creating
** the last element and working backwards.
*/
int mkpath(const char *path, mode_t mode)
{
char *pp;
char *sp;
int status;
char *copypath = STRDUP(path);...
Python nonlocal statement
...e beauty of higher order functions. Also in functional programming this is called composition, python is not a pure FP language but you can certainly play with a features (generators, higher order functions are some examples)
– superuseroi
Mar 30 '15 at 21:24
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how does multiplication differ for NumPy Matrix vs Array classes?
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By the way, why is matrix multiplication called "dot"? In what sense is it a dot product?
– amcnabb
Mar 14 '13 at 18:13
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Pushing to Git returning Error Code 403 fatal: HTTP request failed
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change it from url=https://MichaelDrogalis@github.com/derekerdmann/lunch_call.git to url=git@github.com/derekerdmann/lunch_call.git. that is, change all the texts before @ symbol to ssh://git
Save config file and quit. now you could use git push origin master to sync your repo on GitHub
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What is the difference between C# and .NET?
...s. The C# specification says only a very little about the environment (basically, that it should contain some types such as int, but that's more or less all).
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Why isn't Python very good for functional programming? [closed]
...ou have to know whether you want efficiency or persistence, and to scatter calls to list around if you want persistence. (Iterators are use-once)
Python's simple imperative syntax, along with its simple LL1 parser, mean that a better syntax for if-expressions and lambda-expressions is basically impo...
What are the best practices to follow when declaring an array in Javascript?
...rs, but not in ES5 compatible implementations, where the spec says that [] calls an internal constructor, not whatever value Array.constructor happens to have at the time.
– Alnitak
Jul 16 '12 at 19:09
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How can you programmatically tell an HTML SELECT to drop down (for example, due to mouseover)?
...okup for email adresses.
There are many JavaScript+HTML controls that provide this capability--look for autocomplete controls for ideas.
See this link for the Autocomplete control...http://ajaxcontroltoolkit.codeplex.com/
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