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Extracting just Month and Year separately from Pandas Datetime column
...ore. Using df.my_date_column.astype('datetime64[M]'), as in @Juan's answer converts to dates representing the first day of each month.
– Nickolay
May 26 '18 at 19:52
4
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What is the Simplest Way to Reverse an ArrayList?
...;
aList.add("4");
aList.add("5");
Collections.reverse(aList);
System.out.println("After Reverse Order, ArrayList Contains : " + aList);
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Inheriting constructors
...pports C++11 standard, there is a constructor inheritance using using (pun intended). For more see Wikipedia C++11 article. You write:
class A
{
public:
explicit A(int x) {}
};
class B: public A
{
using A::A;
};
This is all or nothing - you cannot inherit only some constructors...
Arguments or parameters? [duplicate]
... how the terms 'arguments' and 'parameters' are used. They seem to be used interchangeably in the programming world.
12 Ans...
How do I concatenate or merge arrays in Swift?
... can concatenate the arrays with +, building a new array
let c = a + b
print(c) // [1.0, 2.0, 3.0, 4.0, 5.0, 6.0]
or append one array to the other with += (or append):
a += b
// Or:
a.append(contentsOf: b) // Swift 3
a.appendContentsOf(b) // Swift 2
a.extend(b) // Swift 1.2
p...
C# 4.0 optional out/ref arguments
...eclare out as an inline discard variable
}
(Thanks @Oskar / @Reiner for pointing this out.)
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Java variable number or arguments for a method
...d foo(String... args) {
for (String arg : args) {
System.out.println(arg);
}
}
which can be called as
foo("foo"); // Single arg.
foo("foo", "bar"); // Multiple args.
foo("foo", "bar", "lol"); // Don't matter how many!
foo(new String[] { "foo", "bar" }); // Arrays are also accepted...
How to read integer value from the standard input in Java
What class can I use for reading an integer variable in Java?
7 Answers
7
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How to avoid overflow in expr. A * B - C * D
...on which looks like:
A*B - C*D , where their types are: signed long long int A, B, C, D;
Each number can be really big (not overflowing its type). While A*B could cause overflow, at same time expression A*B - C*D can be really small. How can I compute it correctly?
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Drawing a line/path on Google Maps
...en busy for a long time finding out how to draw a line between two (GPS) points on the map in HelloMapView but with no luck.
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