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Blocks and yields in Ruby
...trary segments of code.
When a method expects a block, it invokes it by calling the yield function.
This is very handy, for instance, to iterate over a list or to provide a custom algorithm.
Take the following example:
I'm going to define a Person class initialized with a name, and provide a ...
How to drop SQL default constraint without knowing its name?
...llowing script will generate the command to drop the constraint and dynamically execute it.
declare @schema_name nvarchar(256)
declare @table_name nvarchar(256)
declare @col_name nvarchar(256)
declare @Command nvarchar(1000)
set @schema_name = N'MySchema'
set @table_name = N'Department'
set @col_...
Initialize class fields in constructor or at declaration?
...as we don't comment each foreach loop with "this repeats the following for all items in the list", we don't need to constantly restate C#'s default values. We also don't need to pretend that C# has uninitialized semantics. Since the absence of a value has a clear meaning, it's fine to leave it out. ...
Should I put the Google Analytics JS in the or at the end of ?
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Yes, it's fine to do so; I actually have a mix, but have mostly migrated to putting it on the top for the reasons mentioned.
– Chris Arguin
Jul 4 '10 at 12:46
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Is there any boolean type in Oracle databases?
... Michael-O: I have seen that several times. For me, it's 0/1 all the time, but other programmers prefer J/N. (I live in a German speaking country)
– Erich Kitzmueller
Feb 7 '12 at 8:48
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How do I update a GitHub forked repository?
...he URLs of repositories - origin is one, for example.) Then you can fetch all the branches from that upstream repository, and rebase your work to continue working on the upstream version. In terms of commands that might look like:
# Add the remote, call it "upstream":
git remote add upstream htt...
C++ STL Vectors: Get iterator from index?
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Generally, you can use the same arithmetic with STL iterators than with pointers. They are designed to be exchangeable when using STL algorithms.
– Vincent Robert
Mar 22 '09 at 21:07
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How dangerous is it to access an array out of bounds?
... repeatedly accessing a single memory location in a tight loop could literally cause that chunk of memory to melt. Other possibilities include destroying a CRT display, and moving the read/write head of a disk drive with the harmonic frequency of the drive cabinet, causing it to walk across a table...
Do spurious wakeups in Java actually happen?
...hread_cond_wait() function in Linux is implemented using the futex system call. Each blocking system call on Linux returns abruptly with EINTR when the process receives a signal. ... pthread_cond_wait() can't restart the waiting because it may miss a real wakeup in the little time it was outside the...
.NET String.Format() to add commas in thousands place for a number
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@MacSigler It's actually not true, see Roger Lipscombe's comment on the answer above: String.Format will apply localization automatically.
– Dan Bechard
Oct 17 '13 at 19:34
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