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Length of an integer in Python
...f digits in the integer, you can always convert it to string like str(133) and find its length like len(str(123)).
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How to watch for array changes?
...-based assignment? I want something that would fire an event that I could handle.
10 Answers
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How to rollback just one step using rake db:migrate
After adding migration files in the db/migrate folder and running rake db:migrate , I want get back to the previous step, I think using VERSION=n is the right way to do that, but I don't know the correct value of n to use. Is there any command to check the current n value?
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Draw multi-line text to Canvas
...es... I'd like to write multi-line text to a custom View via a Canvas , and in onDraw() I have:
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How can I propagate exceptions between threads?
... Sep 6 '15 at 21:22
Gerardo HernandezGerardo Hernandez
1,4301313 silver badges1919 bronze badges
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关于php的socket初探 - PHP - 清泛IT论坛，有思想、有深度
..._enable($buffer, EV_READ | EV_PERSIST);
// we need to save both buffer and connection outside
self::$connections[$id] = $connection;
self::$buffers[$id] = $buffer;
}
function ev_error($buffer, $error, $id)
{
event_buffer_disable(self::$buffers[$id], EV_READ | EV_WRITE);
event_buf...
When NOT to use yield (return) [duplicate]
... this O(n) times for a tree with n items, that makes the algorithm O(hn). And since the height of a binary tree is lg n <= h <= n, that means that the algorithm is at best O(n lg n) and at worst O(n^2) in time, and best case O(lg n) and worse case O(n) in stack space. It is O(h) in heap space...
How to determine an interface{} value's “real” type?
... v + " Yeah!" is possible.
fmt.Printf("String: %v", v)
default:
// And here I'm feeling dumb. ;)
fmt.Printf("I don't know, ask stackoverflow.")
}
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Recursion or Iteration?
...e is recursive call). Tail recursion should be recognized by the compiler and optimized to its iterative counterpart (while maintaining the concise, clear implementation you have in your code).
I would write the algorithm in the way that makes the most sense and is the clearest for the poor sucker...
How to calculate time elapsed in bash script?
I print the start and end time using date +"%T" , which results in something like:
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