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What does @@variable mean in Ruby?
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A variable prefixed with @ is an instance variable, while one prefixed with @@ is a class variable. Check out the following example; its output is in the comments at the end of the puts lines:
class Test
@@shared = 1
def value
@@shared
end
def value=(value)
@@shar...
Does Python have a ternary conditional operator?
...n does not have a ternary conditional operator, is it possible to simulate one using other language constructs?
26 Answers
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SELECT DISTINCT on one column
...t.MinID
EDIT
once the OP corrected his samle output (previously had only ONE result row, now has all shown), this is the correct query:
declare @TestData table (ID int, sku char(6), product varchar(15))
insert into @TestData values (1 , 'FOO-23' ,'Orange')
insert into @TestData values (2 , ...
How to merge a specific commit in Git
...here C' has a different SHA-1 ID.
Likewise, cherry picking a commit from one branch to another basically involves generating a patch, then applying it, thus losing history that way as well.
This changing of commit IDs breaks git's merging functionality among other things (though if used spari...
How do I “commit” changes in a git submodule? [duplicate]
...n various submodules, you can (or will be soon able to) push everything in one go (ie one push from the parent repo), with:
git push --recurse-submodules=on-demand
git1.7.11 ([ANNOUNCE] Git 1.7.11.rc1) mentions:
"git push --recurse-submodules" learned to optionally look into the histories of ...
jQuery .live() vs .on() method for adding a click event after loading dynamic html
...vent handling (the event handling is delegated to a parent object).
It's done this way because you can attach the event to the #parent object even when the #child object does not exist yet, but when it later exists and gets clicked on, the click event will bubble up to the #parent object, it will s...
Error handling with node.js streams
...you are working in objectMode = true. The callback is called when you are done processing the chunk. This chunk is then pushed on to the next stream.
If you want a nice helper module that will enable you to do through stream really really easily, I suggest through2.
For error handling, keep readi...
How to encrypt String in Java
...is to encrypt string which will show up in 2D barcode(PDF-417) so when someone get an idea to scan it will get nothing readable.
...
How do you represent a graph in Haskell?
... Knot to get around this, but that makes my brain hurt (because I haven't done much of it yet). I've done more of my substantial programming in Mercury than Haskell so far, and Mercury is strict so knot-tying doesn't help.
Usually when I've run into this before I've just resorted to additional indi...
Advantages of stateless programming?
...een learning about functional programming (specifically Haskell, but I've gone through tutorials on Lisp and Erlang as well). While I found the concepts very enlightening, I still don't see the practical side of the "no side effects" concept. What are the practical advantages of it? I'm trying to t...