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Difference between dispatch_async and dispatch_sync on serial queue?
...nly return after the block is finished whereas dispatch_async return after it is added to the queue and may not finished.
for this code
dispatch_async(_serialQueue, ^{ printf("1"); });
printf("2");
dispatch_async(_serialQueue, ^{ printf("3"); });
printf("4");
It may print 2413 or 2143 or 1234 bu...
WebClient vs. HttpWebRequest/HttpWebResponse
It seems to me that most of what can be accomplished with HttpWebRequest/Response can also be accomplished with the WebClient class. I read somewhere that WebClient is a high-level wrapper for WebRequest/Response .
So far, I can't see anything that can be accomplished with HttpWebRequest/...
Why use symbols as hash keys in Ruby?
...ically "immutable strings" .. that means that they can not be changed, and it implies that the same symbol when referenced many times throughout your source code, is always stored as the same entity, e.g. has the same object id.
Strings on the other hand are mutable, they can be changed anytime. T...
Get last record in a queryset
...no such ordering
is defined for a given QuerySet,
calling reverse() on it has no real
effect (the ordering was undefined
prior to calling reverse(), and will
remain undefined afterward).
share
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What is the point of Lookup?
...
It's a cross between an IGrouping and a dictionary. It lets you group items together by a key, but then access them via that key in an efficient manner (rather than just iterating over them all, which is what GroupBy lets you...
How do you find the row count for all your tables in Postgres
... for all my tables in Postgres. I know I can do this one table at a time with:
15 Answers
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how to reference a YAML “setting” from elsewhere in the same YAML file?
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I don't think it is possible. You can reuse "node" but not part of it.
bill-to: &id001
given : Chris
family : Dumars
ship-to: *id001
This is perfectly valid YAML and fields given and family are reused in ship-to block. You...
Benchmarking small code samples in C#, can this implementation be improved?
Quite often on SO I find myself benchmarking small chunks of code to see which implemnetation is fastest.
11 Answers
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How to delete or add column in SQLITE?
I want to delete or add column in sqlite database
19 Answers
19
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Bypass popup blocker on window.open when JQuery event.preventDefault() is set
I want to show a JQuery dialog conditionally on click event of an hyperlink .
10 Answers
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