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Scala best way of turning a Collection into a Map-by-key?
If I have a collection c of type T and there is a property p on T (of type P , say), what is the best way to do a map-by-extracting-key ?
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PostgreSQL LIKE query performance variations
...text indexes is not for the LIKE operator at all, it has its own operators and doesn't work for arbitrary strings. It operates on words based on dictionaries and stemming. It does support prefix matching for words, but not with the LIKE operator:
Get partial match from GIN indexed TSVECTOR column
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Windows Forms - Enter keypress activates submit button?
How can I capture enter keypresses anywhere on my form and force it to fire the submit button event?
9 Answers
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How can I convert a character to a integer in Python, and viceversa?
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Use chr() and ord():
>>> chr(97)
'a'
>>> ord('a')
97
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Convert Time from one time zone to another in Rails
... created_at.in_time_zone("EST") is shorter
– Orlando
Jun 14 '12 at 18:00
51
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Python JSON serialize a Decimal object
I have a Decimal('3.9') as part of an object, and wish to encode this to a JSON string which should look like {'x': 3.9} . I don't care about precision on the client side, so a float is fine.
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How to write binary data to stdout in python 3?
...ike using shutil.copyfileobj even when the source file object gives bytes, and not strings. +1
– csl
Jun 19 '15 at 14:45
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Setting “checked” for a checkbox with jQuery
...st one element, you can always just access the underlying HTMLInputElement and modify its .checked property:
$('.myCheckbox')[0].checked = true;
$('.myCheckbox')[0].checked = false;
The benefit to using the .prop() and .attr() methods instead of this is that they will operate on all matched eleme...
What is a difference between
What is the difference between <? super E> and <? extends E> ?
9 Answers
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Is returning by rvalue reference more efficient?
...ptimization). Now, you can do the following
Beta_ab ab = others.toAB();
And it will move construct the temporary into ab, or do RVO to omit doing a move or copy altogether. I recommend you to read BoostCon09 Rvalue References 101 which explains the matter, and how (N)RVO happens to interact with ...