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What's the best way to detect a 'touch screen' device using JavaScript?
...ows 8 even though my screen has no touch sensors. I upgraded my old laptop from Windows 7 to Windows 8.
– Pwner
Nov 26 '12 at 23:30
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Fastest way to replace NAs in a large data.table
... a large data.table , with many missing values scattered throughout its ~200k rows and 200 columns. I would like to re code those NA values to zeros as efficiently as possible.
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What special characters must be escaped in regular expressions?
... doubled-up (like "(\")(/)(\\.)" versus /(")(\/)(\.)/ in JavaScript)
Aside from escapes, different regex implementations may support different modifiers, character classes, anchors, quantifiers, and other features. For more details, check out regular-expressions.info, or use regex101.com to test you...
浅析为什么char类型的范围是 -128~+127 - C/C++ - 清泛网 - 专注C/C++及内核技术
...，全部位都表示数值，比如 char型，8位，用二进制表示为0000 0000 ~ 1111 1111
1111 1111 最大即为十进制255,所以 unsigned char 的范围为0~ 255，在这里普及一下2进制转十进制的方法， 二进制每一位的数值乘以它的位权(2^(n-1),n为自右向左...
How can I use “sizeof” in a preprocessor macro?
...s p__LINE__ as a variable. You would need a preproc macro and use __CONCAT from sys/cdefs.h .
– Coroos
Mar 2 at 11:37
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Bootstrap with jQuery Validation Plugin
...functions for validor and run only validate method with rules. I use Icons from FontAweSome, but you can use Glyphicons as in doc example.
jQuery.validator.setDefaults({
highlight: function (element, errorClass, validClass) {
if (element.type === "radio") {
this.findByName...
List of lists changes reflected across sublists unexpectedly
...rences to it:
x = [1] * 4
l = [x] * 3
print(f"id(x): {id(x)}")
# id(x): 140560897920048
print(
f"id(l[0]): {id(l[0])}\n"
f"id(l[1]): {id(l[1])}\n"
f"id(l[2]): {id(l[2])}"
)
# id(l[0]): 140560897920048
# id(l[1]): 140560897920048
# id(l[2]): 140560897920048
x[0] = 42
print(f"x: {x}")
# ...
How to check if all elements of a list matches a condition?
I have a list consisting of like 20000 lists. I use each list's 3rd element as a flag. I want to do some operations on this list as long as at least one element's flag is 0, it's like:
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How do you assert that a certain exception is thrown in JUnit 4 tests?
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I like this solution but can I download this from a maven repo?
– Selwyn
Mar 31 '15 at 2:07
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How do I tar a directory of files and folders without including the directory itself?
... -printf "%P\n", and then pass that to the tar command (it takes filenames from STDIN using -T -). The -C option is needed so tar knows where the files with relative names are located. The --no-recursion flag is so that tar doesn't recurse into folders it is told to archive (causing duplicate files)...