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Create objective-c class instance by name?
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id object = [[NSClassFromString(@"NameofClass") alloc] init];
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Timer & TimerTask versus Thread + sleep in Java
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How do you do natural logs (e.g. “ln()”) with numpy in Python?
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outoftimeoutoftime
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Why does “while(true)” without “Thread.sleep” cause 100% CPU usage on Linux but not on Windows?
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By default, top on Linux runs in so-called IRIX mode, while the Windows Task Manager does not. L...
What is a unix command for deleting the first N characters of a line?
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Use cut. Eg. to strip the first 4 characters of each line (i.e. start on the 5th char):
tail -...
MySQL DISTINCT on a GROUP_CONCAT()
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GROUP_CONCAT has DISTINCT attribute:
SELECT GROUP_CONCAT(DISTINCT categories ORDER BY categori...
Method to Add new or update existing item in Dictionary
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answered Nov 22 '10 at 11:50
ulrichbulrichb
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Android: create a popup that has multiple selection options
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answered May 5 '13 at 22:07
zbrzbr
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Find rows with multiple duplicate fields with Active Record, Rails & Postgres
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Tested & Working Version
User.select(:first,:email).group(:first,:email).having("count(*) &...
Linq to Entities join vs groupjoin
...cted parents as Id values in a fixed order. Let's use:
var ids = new[] { 3,7,2,4 };
Now the selected parents must be filtered from the parents list in this exact order.
If we do ...
var result = parents.Where(p => ids.Contains(p.Id));
... the order of parents will determine the result. If the p...