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Get index of array element faster than O(n)
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edited Feb 13 '13 at 0:37
answered Jun 5 '11 at 10:41
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Waiting until two async blocks are executed before starting another block
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305
Use dispatch groups: see here for an example, "Waiting on Groups of Queued Tasks" in the "Disp...
undefined method `source_index' for Gem:Module (NoMethodError)
I'm running a Rails 2.3.5 application and upon running script/server I am shown the following:
5 Answers
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Why does CSS work with fake elements?
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edited Jun 3 '14 at 15:09
BoltClock♦
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Difference between '..' (double-dot) and '…' (triple-dot) in range generation?
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edited Dec 21 '16 at 0:33
answered Mar 13 '12 at 19:48
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What is the formal difference in Scala between braces and parentheses, and when should they be used?
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370
I tried once to write about this, but I gave up in the end, as the rules are somewhat diffuse....
LINQ where vs takewhile
...d find all elements matching the condition
var intList = new int[] { 1, 2, 3, 4, 5, -1, -2 };
Console.WriteLine("Where");
foreach (var i in intList.Where(x => x <= 3))
Console.WriteLine(i);
Console.WriteLine("TakeWhile");
foreach (var i in intList.TakeWhile(x => x <= 3))
Console....
How to print without newline or space?
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In Python 3, you can use the sep= and end= parameters of the print function:
To not add a newline to the end of the string:
print('.', end='')
To not add a space between all the function arguments you want to print:
print('a', 'b'...
Append column to pandas dataframe
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135
It seems in general you're just looking for a join:
> dat1 = pd.DataFrame({'dat1': [9,5]})
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