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What is the colon operator in Ruby?
...te some of the things mentioned in the answers:
require 'benchmark'
n = 1_000_000
print '"foo".equal? "foo" -> ', ("foo".equal? "foo"), "\n"
print '"foo" == "foo" -> ', ("foo" == "foo" ), "\n"
print ':foo.equal? :foo -> ', (:foo.equal? :foo ), "\n"
print ':foo == :foo -&g...
What's the simplest way to test whether a number is a power of 2 in C++?
...a clever little bit hack to test that one and only one bit is set.
bool is_power_of_2(int x) {
return x > 0 && !(x & (x−1));
}
For more bit twiddling see here.
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improv...
How to check if a table exists in a given schema
...sts" (no matter who's asking), querying the information schema (information_schema.tables) is incorrect, strictly speaking, because (per documentation):
Only those tables and views are shown that the current user has access
to (by way of being the owner or having some privilege).
The query p...
What is the difference between mocking and spying when using Mockito?
... we create a mock of the ArrayList class:
@Test
public void whenCreateMock_thenCreated() {
List mockedList = Mockito.mock(ArrayList.class);
mockedList.add("one");
Mockito.verify(mockedList).add("one");
assertEquals(0, mockedList.size());
}
As you can see – adding an element in...
Get local IP address in node.js
...
var _ = require('underscore'); var ip = _.chain(require('os').networkInterfaces()).flatten().filter(function(val){ return (val.family == 'IPv4' && val.internal == false) }).pluck('address').first().value(); console.log(ip...
How to remove convexity defects in a Sudoku square?
...he result. These points are the grid line intersections:
centerOfGravity[l_] :=
ComponentMeasurements[Image[l], "Centroid"][[1, 2]]
gridCenters =
Table[centerOfGravity[
ImageData[Dilation[Image[h], DiskMatrix[2]]]*
ImageData[Dilation[Image[v], DiskMatrix[2]]]], {h,
horizontalGrid...
Understanding implicit in Scala
... the implicit class in the scope you are wanting to use
import Extensions._
2.meterToCm // result 200
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Making an array of integers in iOS
...swered Feb 19 '13 at 5:58
didier_v_didier_v_
17277 bronze badges
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Allowed characters in filename [closed]
...X "Fully portable filenames" entry, which lists these: A–Z a–z 0–9 . _ -
– Vladimir Kornea
Jul 2 '14 at 22:31
1
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Error executing command 'ant' on Mac OS X 10.9 Mavericks when building for Android with PhoneGap/Cor
...he binary to your system PATH.
For example, on Mountain Lion, in ~/.bash_profile and ~/.bashrc my path was setup like this:
export ANT_HOME="/usr/share/ant"
export PATH=$PATH:$ANT_HOME/bin
So after uncompressing apache-ant-1.9.2-bin.tar.bz2 I moved the resulting directory to /usr/share/ and re...