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How can I convert this foreach code to Parallel.ForEach?
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Iterations takes place sequentially, one by one
foreach loop is run from a single Thread.
foreach loop is defined in every framework of .NET
Execution of slow processes can be slower, as they're run serially
Process 2 can't start until 1 is done. Process 3 can't start until 2 &...
How do I get python's pprint to return a string instead of printing?
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The pprint module has a command named pformat, for just that purpose.
From the documentation:
Return the formatted representation of object as a string. indent,
width and depth will be passed to the PrettyPrinter constructor as
formatting parameters.
Example:
>>> import ppri...
Rails mapping array of hashes onto single hash
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@redgetan is that any different from input.reduce(:merge)?
– David van Geest
May 12 '15 at 14:13
1
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How to check if array element exists or not in javascript?
...ood of JS
Thus, they have the prototype method hasOwnProperty "inherited" from Object
in my testing, hasOwnProperty can check if anything exists at an array index.
So, as long as the above is true, you can simply:
const arrayHasIndex = (array, index) => Array.isArray(array) && array.h...
What does “abstract over” mean?
...e element type is kind of "hidden" in the second method.
A consequence from our event streams
being first-class values is that we
can abstract over them.
In Swing an event just "happens" out of the blue, and you have to deal with it here and now. Event streams allow you to do all the plumb...
ngClass style with dash in key
...g-class="{'icon-white': someBooleanValue}">
I hope this helps someone from tearing their hair out.
UPDATE:
In older versions of Angular, using a backslash also does the trick, but not in the newer versions.
<i class="icon-home" ng-class="{icon\-white: someBooleanValue}">
The former i...
How to get an array of specific “key” in multidimensional array without looping
Let's assume I have the following multidimensional array (retrieved from MySQL or a service):
4 Answers
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Count how many records are in a CSV Python?
..."# {funcname}")
t = timeit.timeit(f'{funcname}("{filename}")', setup=f'from __main__ import {funcname}', number = 100) / 100
print('Elapsed time : ', t)
print('n = ', func(filename))
print('\n')
def sum1forline(filename):
with open(filename) as f:
return sum(1 for line i...
Matplotlib scatterplot; colour as a function of a third variable
...sed the y position of the point as the value that determines the color:
from matplotlib import pyplot as plt
x = [1, 2, 3, 4, 5, 6, 7, 8, 9]
y = [125, 32, 54, 253, 67, 87, 233, 56, 67]
color = [str(item/255.) for item in y]
plt.scatter(x, y, s=500, c=color)
plt.show()
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How do you enable the escape key close functionality in a Twitter Bootstrap modal?
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This though prevents autofocus from input fields.
– topless
Sep 16 '14 at 15:15
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