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What is Scala's yield?
...rict):
scala> var found = false
found: Boolean = false
scala> List.range(1,10).filter(_ % 2 == 1 && !found).foreach(x => if (x == 5) found = true else println(x))
1
3
7
9
scala> found = false
found: Boolean = false
scala> Stream.range(1,10).filter(_ % 2 == 1 && !fo...
How to automatically generate N “distinct” colors?
...slightly mint green) is imperceptible, while the difference between 30° (orange) and 45° (peach) is quite obvious. You need a non-linear spacing along the hue for best results.
– Phrogz
Feb 21 '12 at 17:05
...
Multiprocessing: How to use Pool.map on a function defined in a class?
..., c) in pipe]
if __name__ == '__main__':
print parmap(lambda x: x**x, range(1, 5))
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What is the difference between __init__ and __call__?
...hown below).
Example.
class Stuff(object):
def __init__(self, x, y, range):
super(Stuff, self).__init__()
self.x = x
self.y = y
self.range = range
def __call__(self, x, y):
self.x = x
self.y = y
print '__call__ with (%d,%d)' % (self...
How do I check in JavaScript if a value exists at a certain array index?
...ray if i is between 0 and array.length - 1 inclusive. If i is not in this range it's not in the array.
So by concept, arrays are linear, starting with zero and going to a maximum, without any mechanism for having "gaps" inside that range where no entries exist. To find out if a value exists at a ...
Getting number of elements in an iterator in Python
...No. It's not possible.
Example:
import random
def gen(n):
for i in xrange(n):
if random.randint(0, 1) == 0:
yield i
iterator = gen(10)
Length of iterator is unknown until you iterate through it.
...
Java 8 forEach with index [duplicate]
...hat you can then just iterate with the indices of the elements:
IntStream.range(0, params.size())
.forEach(idx ->
query.bind(
idx,
params.get(idx)
)
)
;
The resulting code is similar to iterating a list with the classic i++-style for loop, except with easier paralleliza...
Validate that end date is greater than start date with jQuery
...
the only problem is when youu have a date range spanning withi two years eg. 27-06-2015 to 02-02-2016....it won't validate properly
– Himansz
Feb 27 '16 at 11:34
...
How do I check if there are duplicates in a flat list?
...uplicate run
@b.add_arguments('list size')
def arguments():
for exp in range(2, 14):
size = 2**exp
yield size, list(range(size))
# Duplicate at beginning run
@b.add_arguments('list size')
def arguments():
for exp in range(2, 14):
size = 2**exp
yield size, [0,...
python pandas remove duplicate columns
...values()
ks = dcols.keys()
lvs = len(vs)
for i in range(lvs):
for j in range(i+1,lvs):
if vs[i] == vs[j]:
dups.append(ks[i])
break
return dups
Use it like this:
dups = duplicate_columns(frame...