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What is your favorite C programming trick? [closed]
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votes
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Pandas percentage of total with groupby
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Paul H's answer is right that you will have to make a second groupby object, but you can calcu...
How to use a switch case 'or' in PHP
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switch ($value)
{
case 1:
case 2:
echo "the value is either 1 or 2.";
break;...
How do I check if an array includes a value in JavaScript?
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How can I get zoom functionality for images?
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UPDATE
I've just given TouchImageView a new update. It now includes Double Tap Zoom and Fling...
An error occurred while installing pg (0.17.1), and Bundler cannot continue
I just installed Rails 4.0.2 and when creating a new app, in the bundle stage I get:
16 Answers
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Any way to properly pretty-print ordered dictionaries?
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edited Apr 9 '14 at 12:09
user11784
2344 bronze badges
answered Feb 4 '11 at 12:33
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Strange, unexpected behavior (disappearing/changing values) when using Hash default value, e.g. Hash
...s in the array, despite h[1] still giving us a value? Here’s a hint:
h[42] #=> ["a", "b"]
The array returned by each [] call is just the default value, which we’ve been mutating all this time so now contains our new values. Since << doesn’t assign to the hash (there can never be a...
Specifying an Index (Non-Unique Key) Using JPA
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With JPA 2.1 you should be able to do it.
import javax.persistence.Column;
import javax.persi...
Determine if map contains a value for a key?
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Does something along these lines exist?
No. With the stl map class, you use ::find() to s...