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How to create a zip file in Java
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@kdzia, the first line converts the StringBuilder value into a byte array, and the second line takes that byte array and writes it to the ZipEntry within the "test.zip" file. These lines are necessary because Zip files work with byte arrays, not st...
(![]+[])[+[]]… 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...
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...
Coding Practices which enable the compiler/optimizer to make a faster program
...Arithmetic (Edited: applied code format to code fragment, added example)
Convert if statements into boolean assignments. Some processors can conditionally execute instructions without branching:
bool status = true;
status = status && /* first test */;
status = status && /* second...
How to call erase with a reverse iterator
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And here is the piece of code to convert the result of erase back to a reverse iterator in order to erase an element in a container while iterating in the reverse. A bit strange, but it works even when erasing the first or last element:
std::set<int> ...
Vertically align text to top within a UILabel
... Not sure how this will affect the performance if many UILabels are converted to text views.
– ninjaneer
Nov 10 '13 at 12:17
2
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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...
Append a NumPy array to a NumPy array
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Actually one can always create an ordinary list of numpy arrays and convert it later.
In [1]: import numpy as np
In [2]: a = np.array([[1,2],[3,4]])
In [3]: b = np.array([[1,2],[3,4]])
In [4]: l = [a]
In [5]: l.append(b)
In [6]: l = np.array(l)
In [7]: l.shape
Out[7]: (2, 2, 2)
In [8]...
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
add a comment
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What is the purpose of using -pedantic in GCC/G++ compiler?
...o issue warnings in such cases. Using the stricter
-pedantic-errors option converts such diagnostic warnings into errors that will cause compilation
to fail at such points. Only those non-ISO constructs that are required to be flagged by a conforming
compiler will generate warnings or errors.
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