大约有 30,000 项符合查询结果（耗时：0.1052秒） [XML]
Set a default parameter value for a JavaScript function
... default named parameters via destructuring:
// the `= {}` below lets you call the function without any parameters
function myFor({ start = 5, end = 1, step = -1 } = {}) { // (A)
// Use the variables `start`, `end` and `step` here
···
}
Pre ES2015,
There are a lot of ways, but this is...
How to assign from a function which returns more than one value?
...length(lhs) > 1)
lhs <- lhs[-1]
if (length(lhs) == 1) {
do.call(`=`, list(lhs[[1]], rhs), envir=frame)
return(invisible(NULL))
}
if (is.function(rhs) || is(rhs, 'formula'))
rhs <- list(rhs)
if (length(lhs) > length(rhs))
rhs <- c(rhs, rep(list(NULL), lengt...
How do I get the path of the current executed file in Python?
...all. For example, it could come from the interactive interpreter or dynamically generated code stored only in memory.
However, you can reliably determine the location of a module, since modules are always loaded from a file. If you create a module with the following code and put it in the same di...
Reliable way for a Bash script to get the full path to itself [duplicate]
... This does not work if the script is in a directory from the $PATH and you call it bash scriptname. In such a case $0 does not contain any path, just scriptname.
– pabouk
Jun 15 '15 at 10:40
...
Placeholder in IE9
...use on single page applications. You need to trigger it manually for dynamically added fields. Other than that, works great!
– smets.kevin
Nov 18 '13 at 14:41
1
...
Angular.js ng-repeat across multiple tr's
I am using Angular.js for an application that uses hidden trs to simulate a sliding out effect by showing the tr and sliding down the div in the td below. This process worked fantastically using knockout.js when iterating over an array of these rows, because I could use <!-- ko:foreach --> a...
Reverse a string in Python
...
@Tanner [::-1] is fastest because it does not call any external functions, rather it's using slicing, which is highly-optimized in python. ''.join(list(reversed(s))) makes 3 function calls.
– hd1
Apr 27 at 13:51
...
Best way to serialize an NSData into a hexadeximal string
...malString = [someData hexadecimalString];
This is "probably" better than calling [someData description] and then stripping the spaces, <'s, and >'s. Stripping characters just feels too "hacky". Plus you never know if Apple will change the formatting of NSData's -description in the future.
N...
Cleanest way to write retry logic?
...
Blanket catch statements that simply retry the same call can be dangerous if used as a general exception handling mechanism. Having said that, here's a lambda-based retry wrapper that you can use with any method. I chose to factor the number of retries and the retry timeout ou...
Test if characters are in a string
...pression" below, but the idea is it's a smarter way to match the string (R calls this "character", eg class("abc")), and "Print" because it's a command line program, emitting output means it prints to its output string.
Now, the grep program is basically a filter, from lines of input, to lines of o...