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What is the difference between statically typed and dynamically typed languages?
...t core to the language and usable on demand.
When it comes to technology selection, neither side has an intrinsic superiority over the other. It is just a matter of preference whether you want more control to begin with or flexibility. just pick the right tool for the job, and make sure to check w...
How do I apply a perspective transform to a UIView?
...zip it
Go into the folder you unzipped, open its iCarousel subfolder, then select iCarousel.h and iCarousel.m and drag them into your project navigation – that's the left pane in Xcode. Just below Info.plist is fine.
Check "Copy items if needed" then click Finish.
Xcode will prompt you with the me...
How to change line-ending settings
...se GIT and in the "Line Ending Conversion" Section make sure that you have selected "Check out as is - Check in as is"option.
(2)and keep the remaining configurations as it is.
(3)once installation is done
(4)write all the file extensions which are converted to UNIX format into a text file (exten...
How do I clear a search box with an 'x' in bootstrap 3?
...button) in other browsers, such as Firefox, so Firefox users could instead select the text and press delete, or...
If you really need this nice-to-have feature supported in Firefox, then you could implement one of the other solutions posted here as a polyfill for input[type=search] elements. A poly...
Check if an apt-get package is installed and then install it if it's not on Linux
... is available
The documentations are also very unclear, e.g.:
sudo apt dselect-upgrade
did not remove certbot when it was marked as deinstall, even though man apt-get seems to indicate that:
dselect-upgrade is used in conjunction with the traditional Debian packaging front-end, dselect(1). ...
Count with IF condition in MySQL query
...
Use sum() in place of count()
Try below:
SELECT
ccc_news . * ,
SUM(if(ccc_news_comments.id = 'approved', 1, 0)) AS comments
FROM
ccc_news
LEFT JOIN
ccc_news_comments
ON
ccc_news_comments.news_id = ccc_news.news_id
WHERE
`ccc_...
理解和配置 Linux 下的 OOM Killer - 操作系统(内核) - 清泛网 - 专注C/C++及内核技术
...当系统内存不足的时候，out_of_memory() 被触发，然后调用 select_bad_process() 选择一个 “bad” 进程杀掉，如何判断和选择一个 “bad” 进程呢，总不能随机选吧？挑选的过程由 oom_badness() 决定，挑选的算法和想法都很简单很朴实：最...
Why should hash functions use a prime number modulus?
...er of buckets. This is convenient and saves having to search around or pre-select a prime number of the right magnitude. So you rely on the hash function not to use even multipliers, which is generally a safe assumption. But you can still get occasional bad hashing behaviours based on hash functions...
git replacing LF with CRLF
...tory -> checked out file
How to fix
Default value for core.autocrlf is selected during git installation and stored in system-wide gitconfig (%ProgramFiles(x86)%\git\etc\gitconfig). Also there're (cascading in the following order):
– "global" (per-user) gitconfig located at ~/.gitconfig,...
Learning Python from Ruby; Differences and Similarities
...lues greater than 15. In Ruby, you'd have to write the following:
values.select {|v| v > 15}.map {|v| v * v}
The Ruby code doesn't feel as compact. It's also not as efficient since it first converts the values array into a shorter intermediate array containing the values greater than 15. Th...