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Call by name vs call by value in Scala, clarification needed
... => Int).
def callByValue(x: Int) = {
println("x1=" + x)
println("x2=" + x)
}
def callByName(x: => Int) = {
println("x1=" + x)
println("x2=" + x)
}
Now what happens when we call them with our side-effecting function?
scala> callByValue(something())
calling something
x1=1
x2=1
...
Bitwise operation and usage
... the lower 4 bits of an integer, you AND it with 15 (binary 1111) so:
201: 1100 1001
AND 15: 0000 1111
------------------
IS 9 0000 1001
The zero bits in 15 in that case effectively act as a filter, forcing the bits in the result to be zero as well.
In addition, >> and << ar...
Does JavaScript guarantee object property order?
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12 Answers
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How to map atan2() to degrees 0-360
atan2(y, x) has that discontinuity at 180° where it switches to -180°..0° going clockwise.
15 Answers
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How to check if type of a variable is string?
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20 Answers
20
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Dealing with “Xerces hell” in Java/Maven?
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There are 2.11.0 JARs (and source JARs!) of Xerces in Maven Central since 20th February 2013! See Xerces in Maven Central. I wonder why they haven't resolved https://issues.apache.org/jira/browse/XERCESJ-1454...
I've used:
<depend...
How can I convert immutable.Map to mutable.Map in Scala?
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128
The cleanest way would be to use the mutable.Map varargs factory. Unlike the ++ approach, this...
Size-limited queue that holds last N elements in Java
...eue;
Queue<Integer> fifo = new CircularFifoQueue<Integer>(2);
fifo.add(1);
fifo.add(2);
fifo.add(3);
System.out.println(fifo);
// Observe the result:
// [2, 3]
If you are using an older version of the Apache commons collections (3.x), you can use the Circ...
Rails ActiveRecord date between
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edited Mar 16 '17 at 18:26
thutt
58333 silver badges1515 bronze badges
answered Oct 18 '12 at 2:10
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Check if a value exists in pandas dataframe index
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258
This should do the trick
'g' in df.index
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