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Why is $$ returning the same id as the parent process?
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$$ is defined to return the process ID of the parent in a subshell; from the man page under "Special Parameters":
$ Expands to the process ID of the shell. In a () subshell, it expands to the process ID of the current shell, not the subshell.
In bash 4, you can get the process ID...
Matrix Transpose in Python
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if you're going to iterate through the results, izip from itertools can save memory for large arrays.
– Antony Hatchkins
Mar 28 '13 at 8:38
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npm can't find package.json
... for the tutorial - in this case the package.json is in the dir you cloned from git in the prior step (docs.angularjs.org/tutorial)
– Kevin Hooke
Sep 30 '14 at 21:32
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How to use `string.startsWith()` method ignoring the case?
...true, 0, needle, 0, 5)); // true
It checks whether the region of needle from index 0 till length 5 is present in haystack starting from index 0 till length 5 or not. The first argument is true, means it will do case-insensitive matching.
And if only you are a big fan of Regex, you can do somet...
Assigning code to a variable
...nClick(OnButtonClick);
ButtonClicked(); // Execute the function.
}
From here, we can move to lambda expressions and see how they could be useful in your situation:
There are many delegates already defined by .NET libraries, with some like Action, which do not accept any parameter and does no...
When to use IList and when to use List
...hout the consuming method ever knowing. I thought I'd never need to change from a List<T> but had to later change to use a custom list library for the extra functionality it provided. Because I'd only returned an IList<T> none of the people that used the library had to change their code....
Get key by value in dictionary
... a list of pairs would discard the context that one item is a 'definition' from the other, e.g. in parameter lists...
– Louis Maddox
Oct 13 '16 at 13:20
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How to convert a table to a data frame
...rs, another way I've used is data.frame(rbind(mytable)). Using the example from @X.X:
> freq_t = table(cyl = mtcars$cyl, gear = mtcars$gear)
> freq_t
gear
cyl 3 4 5
4 1 8 2
6 2 4 1
8 12 0 2
> data.frame(rbind(freq_t))
X3 X4 X5
4 1 8 2
6 2 4 1
8 12 0 2
If t...
Executing periodic actions in Python [duplicate]
...o precision of the time module (unlike several of the solutions I've tried from stack exchange).
Note: for Python 2.x, replace next(g) below with g.next().
import time
def do_every(period,f,*args):
def g_tick():
t = time.time()
while True:
t += period
yie...
Assigning out/ref parameters in Moq
...ith the out parameter and assign the value in the callback with the syntax from above
– royalTS
Jul 25 '19 at 7:06
wor...