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Builder Pattern in Effective Java
...Bloch. I found the idea of the Builder pattern [Item 2 in the book] really interesting. I tried to implement it in my project but there were compilation errors. Following is in essence what I was trying to do:
...
Single vs double quotes in JSON
...08565','name':'xyz','description':'can control TV\'s and more'})
Step 1: convert the incoming string into a dictionary using ast.literal_eval()
Step 2: apply json.dumps to it for the reliable conversion of keys and values, but without touching the contents of values:
>>> import ast
>&...
Predicate Delegates in C#
...ons.Generic;
class Program
{
static void Main()
{
List<int> list = new List<int> { 1, 2, 3 };
Predicate<int> predicate = new Predicate<int>(greaterThanTwo);
List<int> newList = list.FindAll(predicate);
}
static bool greaterTha...
Random date in C#
...
DateTime RandomDay()
{
DateTime start = new DateTime(1995, 1, 1);
int range = (DateTime.Today - start).Days;
return start.AddDays(gen.Next(range));
}
For better performance if this will be called repeatedly, create the start and gen (and maybe even range) variables outside ...
Int or Number DataType for DataAnnotation validation attribute
...o use different different range validation as per your requirements :
For Integer
[Range(0, int.MaxValue, ErrorMessage = "Please enter valid integer Number")]
for float
[Range(0, float.MaxValue, ErrorMessage = "Please enter valid float Number")]
for double
[Range(0, double.MaxValue, ErrorMe...
dynamically add and remove view to viewpager
...the page no longer exists,
// return POSITION_NONE.
@Override
public int getItemPosition (Object object)
{
int index = views.indexOf (object);
if (index == -1)
return POSITION_NONE;
else
return index;
}
//----------------------------------------------------------...
Implement Stack using Two Queues
...:
while size of queue1 is bigger than 1, pipe dequeued items from queue1 into queue2
dequeue and return the last item of queue1, then switch the names of queue1 and queue2
Version B (efficient pop):
push:
enqueue in queue2
enqueue all items of queue1 in queue2, then switch the names of queu...
ActiveRecord OR query
...zation and make your queries DB agnostic. The only overhead is where Rails converts the syntax to SQL query. And it is just a matter of milliseconds. Ofcourse you should write the best performant SQL query and try to convert it to ActiveRecord syntax. If the SQL cannot be represented in ActiveRecord...
“int main (vooid)”? How does that work?
...he "old-style" function-declaration syntax; you're implicitly declaring an int parameter called vooid.
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How to break out of nested loops?
... @ugoren It's also so simple then. what if you used a const int count =1000 , in the global Initialization. or as a #define macro.
– Laksith
Oct 19 '15 at 7:37
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