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(![]+[])[+[]]… Explain why this works
...e second operand of the addition, an empty Array, [], this is made just to convert the false value to String, because the string representation of an empty array is just an empty string, is equivalent to:
false+[]; // "false"
false+''; // "false"
The last part, the pair of square brackets after t...
Case-insensitive string comparison in C++ [closed]
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@wonkorealtime: because "ß" converted to uppercase is "SS": fileformat.info/info/unicode/char/df/index.htm
– Mooing Duck
May 29 '14 at 23:11
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Combine two columns of text in pandas dataframe
...arter"]
If one (or both) of the columns are not string typed, you should convert it (them) first,
df["period"] = df["Year"].astype(str) + df["quarter"]
Beware of NaNs when doing this!
If you need to join multiple string columns, you can use agg:
df['period'] = df[['Year', 'quarter', ...]].a...
Scanning Java annotations at runtime [closed]
... Updated to use Java7, no problem. Just remove the annoations and convert the functions to use anonymous inner classes. I like the 1 file style. The code is nice an clean, so even though it doesn't support a few things I would like (class + annotation at same time) I think that would be p...
How to flatten tree via LINQ?
...n then filter by group using Where(...).
To earn some "points for style", convert Flatten to an extension function in a static class.
public static IEnumerable<MyNode> Flatten(this IEnumerable<MyNode> e) =>
e.SelectMany(c => c.Elements.Flatten()).Concat(e);
To earn more poi...
How to round to 2 decimals with Python?
...etting a lot of decimals in the output of this code (Fahrenheit to Celsius converter).
16 Answers
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What is the best way to get the count/length/size of an iterator?
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Using Guava library, another option is to convert the Iterable to a List.
List list = Lists.newArrayList(some_iterator);
int count = list.size();
Use this if you need also to access the elements of the iterator after getting its size. By using Iterators.size() you...
Memoization in Haskell?
... r = l + s
s' = s * 2
Since we can index, you can just convert a tree into a list:
toList :: Tree a -> [a]
toList as = map (index as) [0..]
You can check the work so far by verifying that toList nats gives you [0..]
Now,
f_tree :: Tree Int
f_tree = fmap (f fastest_f) nat...
How do I work around JavaScript's parseInt octal behavior?
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This whole question is about alternatives to parseInt for converting strings to integers. Thus: always.
– Grodriguez
Oct 25 '14 at 9:55
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How to find out what type of a Mat object is with Mat::type() in OpenCV
...u need to know what type an internal OpenCV array is.
Remember OpenCV will convert the jpeg into BGR (or grey scale if you pass '0' to imread) - so it doesn't tell you anything about the original file.
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