大约有 3,300 项符合查询结果（耗时：0.0324秒） [XML]
Which way is best for creating an object in JavaScript? Is `var` necessary before an object property
...objects. In your example, Person (you should start the name with a capital letter) is called the constructor function. This is similar to classes in other OO languages.
Use way 2 if you only need one object of a kind (like a singleton). If you want this object to inherit from another one, then you h...
What is the Scala identifier “implicitly”?
...alphabetic member index currently available in the Scaladoc nightlies. The letters (and the #, for non-alphabetic names) at the top of the package / class pane are links to the index for member names beginning with that letter (across all classes). If you choose I, e.g., you'll find the implicitly e...
Batch script: how to check for admin rights
...therwise. %systemdrive% is an environment variable which returns the drive letter where the operating system is installed. The output is redirected to nul, thus ignored. The %errorlevel% variable will be set to 0 only upon successful execution.
Here is what the documentation says:
Fsutil dirty
...
Can dplyr package be used for conditional mutating?
...DT <- setDT(lapply(1:6, function(x) sample(7, 1e7, TRUE)))
setnames(DT, letters[1:6])
# > dim(DT)
# [1] 10000000 6
DF <- as.data.frame(DT)
DT_fun <- function(DT) {
DT[(a %in% c(0,1,3,4) | c == 4), g := 3L]
DT[a %in% c(2,5,7) | (a==1 & b==4), g := 2L]
}
DPLYR_fun <...
How to run a program without an operating system?
...ters one by one.
The important link flags are:
--oformat binary: output raw binary assembly code, don't wrap it inside an ELF file as is the case for regular userland executables.
To better understand the linker script part, familiarize yourself with the relocation step of linking: What do linke...
CSS: fixed position on x-axis but not y?
...ne, but they are typically abbreviated and only referred to by their first letter. The sequence of these different nitrogen bases makes up the code of the DNA.
The DNA strand splits in two, and forms two different DNA strands during cell replication. However, sometimes this process is not perfect...
How can bcrypt have built-in salts?
...m PasswordEncoder interface documentation from Spring Security,
* @param rawPassword the raw password to encode and match
* @param encodedPassword the encoded password from storage to compare with
* @return true if the raw password, after encoding, matches the encoded password from
* storage
*...
What specific productivity gains do Vim/Emacs provide over GUI text editors?
...r me, the handiest thing is to jump forward to (or just before) a specific letter or combination of letters, or jump back, with a couple of keystrokes. Jumping forward by the same condition twice, or ten times, is simply a matter of prefixing it with a number.
If you've to repeat an edit, you jump ...
Permutations in JavaScript?
...er results for a fixed n = 2? For example, suppose we have a set of three letters: A, B, and C. We might ask how many ways we can arrange 2 letters from that set. Each possible arrangement would be an example of a permutation. The complete list of possible permutations would be: AB, AC, BA, BC, CA,...
MVC (Laravel) where to add logic
...
// post as created by the current user.
$post->user_id = auth()->id();
}
$post->title = $this->title;
$post->description = $this->description;
// Perform other tasks, maybe fire an event, dispatch a job.
if ($post-...