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form_for but to post to a different action
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@lulalala, of course, you must set routes as well. in this case, like: resources :users do collection do get :myaction end end
– tagaism
Apr 5 '19 at 11:57
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Why is iostream::eof inside a loop condition (i.e. `while (!stream.eof())`) considered wrong?
...data;
// oh crap, now we read the end and *only* now the eof bit will be set (as well as the fail bit)
// do stuff with (now uninitialized) data
}
Against this:
int data;
while(inStream >> data){
// when we land here, we can be sure that the read was successful.
// if it wasn't, the...
How to diff one file to an arbitrary version in Git?
How can I diff a file, say pom.xml , from the master branch to an arbitrary older version in Git?
13 Answers
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Adding gif image in an ImageView in android
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First, copy your GIF image into Asset Folder of your app
create following classes and paste the code
AnimationActivity: -
public class AnimationActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundl...
Big-O summary for Java Collections Framework implementations? [closed]
...) O(1)
CopyOnWrite-ArrayList O(1) O(n) O(n) O(1) O(n) O(n)
Set implementations:
add contains next notes
HashSet O(1) O(1) O(h/n) h is the table capacity
LinkedHashSet O(1) O(1) O(1)
CopyOnWriteArraySet O(n) ...
Validate that a string is a positive integer
...t;> 0 === 10000000
parseFloat does correct parsing of string numbers (setting NaN for non numeric strings)
TESTS:
"0" : true
"23" : true
"-10" : false
"10.30" : false
"-40.1" : false
"string" ...
T-SQL: Opposite to string concatenation - how to split string into multiple records [duplicate]
...declare @nextString nvarchar(4000)
declare @pos int, @nextPos int
set @nextString = ''
set @string = @string + @delimiter
set @pos = charindex(@delimiter, @string)
set @nextPos = 1
while (@pos <> 0)
begin
set @nextString = substring(@string, 1, @pos - 1)
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Elegant way to invert a map in Scala
...ve), e.g., from Map[A,B], you can't get Map[B,A], but rather you get Map[B,Set[A]], because there might be different keys associated with same values. So, if you are interested in knowing all the keys, here's the code:
scala> val m = Map(1 -> "a", 2 -> "b", 4 -> "b")
scala> m.groupB...
error: ‘NULL’ was not declared in this scope
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How to add an extra column to a NumPy array
...ightforward than the answer by @JoshAdel, but when dealing with large data sets, it is slower. I'd pick between the two depending on the importance of readability.
– dvj
Aug 22 '15 at 22:08
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