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querySelector and querySelectorAll vs getElementsByClassName and getElementById in JavaScript
...d getElementById?
The syntax and the browser support.
querySelector is more useful when you want to use more complex selectors.
e.g. All list items descended from an element that is a member of the foo class: .foo li
document.querySelector("#view:_id1:inputText1") it doesn't work. But writi...
Selecting only numeric columns from a data frame
...ly, even though it's less code
## nums <- sapply(x, is.numeric)
For a more idiomatic modern R I'd now recommend
x[ , purrr::map_lgl(x, is.numeric)]
Less codey, less reflecting R's particular quirks, and more straightforward, and robust to use on database-back-ended tibbles:
dplyr::select_i...
A weighted version of random.choice
...b5050, Mar 21 2017, 01:21:04)
Type 'copyright', 'credits' or 'license' for more information
IPython 6.0.0 -- An enhanced Interactive Python. Type '?' for help.
In [1]: import random
In [2]: random.choices(
...: population=[['a','b'], ['b','a'], ['c','b']],
...: weights=[0.2, 0.2, 0.6],
......
Suppressing deprecated warnings in Xcode
...trating for newbs. Try it where? How do I find target settings? A little more explanation would increase the value of this answer.
– noogrub
Oct 14 '12 at 11:36
8
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How to get distinct values from an array of objects in JavaScript?
...
I think flags = {} is more better than flags = []
– zhuguowei
Jun 12 '17 at 9:35
3
...
Iterate through a HashMap [duplicate]
... it.remove(); // avoids a ConcurrentModificationException
}
}
Read more about Map.
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Create array of regex matches
...times. Granted, if you expect just a few matches then your approach is the more efficient one; if however you find that the array "resizing" happens more than once I would suggest a LinkedList, even more so if you're dealing with a low latency app.
– Liv
May 16...
Python memory leaks [closed]
...rint_diff) | 1 | 480 B
This package provides a number of more features. Check pympler's documentation, in particular the section Identifying memory leaks.
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stdlib and colored output in C
...and other things.
Don't bother with libraries, the code is really simple.
More info is here.
Example in C:
#include <stdio.h>
#define ANSI_COLOR_RED "\x1b[31m"
#define ANSI_COLOR_GREEN "\x1b[32m"
#define ANSI_COLOR_YELLOW "\x1b[33m"
#define ANSI_COLOR_BLUE "\x1b[34m"
#define ANSI...