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LINQ where vs takewhile
...
Where can examine the whole sequence looking for matches.
Enumerable.Range(1, 10).Where(x => x % 2 == 1)
// 1, 3, 5, 7, 9
TakeWhile stops looking when it encounters the first non-match.
Enumerable.Range(1, 10).TakeWhile(x => x % 2 == 1)
// 1
...
Difference between reduce and foldLeft/fold in functional programming (particularly Scala and Scala
...me("Simple Application")
implicit val sc = new SparkContext(conf)
val range = ('a' to 'z').map(_.toString)
val rdd = sc.parallelize(range)
println(range.reduce(_ + _))
println(rdd.reduce(_ + _))
println(rdd.fold("")(_ + _))
}
Print out:
abcdefghijklmnopqrstuvwxyz
abcghituvjklmwxy...
Git interactive rebase no commits to pick
...
rebase -i without a commit range will not display any commits. to rebase the last, say, 7 commits use the following:
git rebase -i HEAD~7
be careful though, that this will rewrite history. don't do it, if the commits are already pushed
for your s...
How to test multiple variables against a value?
...r an item out of 2-4 possibilities, a tuple is still faster! If you can arrange for the most likely case to be first in the tuple, the win is even bigger: (my test: timeit.timeit('0 in {seq}'.format(seq=tuple(range(9, -1, -1)))))
– SingleNegationElimination
Oc...
Advantage of switch over if-else statement
...l throw an exception on out-of-bounds values. (bitset::operator[] doesn't range-check). cplusplus.com/reference/bitset/bitset/test. This will probably outperform a compiler-generated jump table implementing switch, esp. in the not-special case where this will be a single not-taken branch.
...
How do I create a datetime in Python from milliseconds?
...ion: "fromtimestamp() may raise ValueError, if the timestamp is out of the range of values supported by the platform C localtime() or gmtime() functions. It’s common for this to be restricted to years in 1970 through 2038." - how long is your code expected to last???
– mike ...
Which MySQL data type to use for storing boolean values
... bit-field
values. A type of BIT(M) enables storage of M-bit values. M can range
from 1 to 64.
Otherwise, according to the MySQL manual you can use BOOL or BOOLEAN, which are at the moment aliases of tinyint(1):
Bool, Boolean: These types are synonyms for TINYINT(1). A value of
zero is considered ...
Set a default font for whole iOS app?
...turn self.font.fontName }
set {
if self.font.fontName.range(of:"Medium") == nil {
self.font = UIFont(name: newValue, size: self.font.pointSize)
}
}
}
@objc var substituteFontNameBold : String {
get { return self.font.fontName...
Print a string as hex bytes?
....hexlify(b"Hello world !!") to get hex string. b":".join(h[i:i+2] for i in range(0, len(h), 2)) to insert ':' after every two hex digits in it.
– jfs
Mar 12 '14 at 1:17
...
Google Sheets API Setup · App Inventor 2 中文网
...json
file you got from the Service Account setup steps.
Unable to parse range: ______
If you get this error message, there may be an error with the range that you
provided. This could mean that the sheetName you’ve provided does not actually
exist, or that the reference you provided is not va...