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What is the fastest or most elegant way to compute a set difference using Javascript arrays?
...don't know if this is most effective, but perhaps the shortest
A = [1, 2, 3, 4];
B = [1, 3, 4, 7];
diff = A.filter(function(x) { return B.indexOf(x) < 0 })
console.log(diff);
Updated to ES6:
A = [1, 2, 3, 4];
B = [1, 3, 4, 7];
diff = A.filter(x => !B.includes(x) );
console.log(diff);
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Scala 2.8 breakOut
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325
The answer is found on the definition of map:
def map[B, That](f : (A) => B)(implicit bf :...
How can I add new array elements at the beginning of an array in Javascript?
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2943
Use unshift. It's like push, except it adds elements to the beginning of the array instead of th...
Bootstrap 3: pull-right for col-lg only
New to bootstrap 3.... In my layout I have:
13 Answers
13
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UnicodeDecodeError: 'ascii' codec can't decode byte 0xd1 in position 2: ordinal not in range(128)
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153
Unicode is not equal to UTF-8. The latter is just an encoding for the former.
You are doing it ...
Linear Regression and group by in R
...e ~ year | state, data = d)
Coefficients:
(Intercept) year
CA -1.34420990 0.17139963
NY 0.00196176 -0.01852429
Degrees of freedom: 20 total; 16 residual
Residual standard error: 0.8201316
share
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Adding information to an exception?
...bar('arg1')
Traceback (most recent call last):
File "test.py", line 13, in <module>
bar('arg1')
File "test.py", line 11, in bar
raise type(e)(e.message + ' happens at %s' % arg1)
IOError: Stuff happens at arg1
Update 1
Here's a slight modification that preserves the original...
Open and write data to text file using Bash?
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edited Nov 13 '14 at 18:40
Martin Tournoij
22.1k1717 gold badges8585 silver badges116116 bronze badges
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Unix's 'ls' sort by name
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131
My ls sorts by name by default. What are you seeing?
man ls states:
List information about th...
Which is the preferred way to concatenate a string in Python?
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443
The best way of appending a string to a string variable is to use + or +=. This is because it's ...