大约有 40,000 项符合查询结果（耗时：0.0557秒） [XML]
When to use -retainCount?
...turned on and you can go into any object and see its retainCount history.
By pairing allocs and releases you can get a good picture of what is going on and often solve those difficult cases where something is not being released.
This has never let me down - including finding bugs in early beta rel...
An efficient compression algorithm for short text strings [closed]
I'm searching for an algorithm to compress small text strings: 50-1000 bytes (i.e. URLs). Which algorithm works best for this?
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force browsers to get latest js and css files in asp.net application
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I solved this by tacking a last modified timestamp as a query parameter to the scripts.
I did this with an extension method, and using it in my CSHTML files. Note: this implementation caches the timestamp for 1 minute so we don't thras...
Ignore whitespace in HTML [duplicate]
...ut "hacking around" something. The layout should preferrably be controlled by the CSS, so specifying how the images are displayed should actually rather be in the CSS than in the HTML.
– Guffa
Apr 13 '10 at 10:56
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How do I abort/cancel TPL Tasks?
...NewTask(Action method). Inside the StartNewTask method I create a new Task by: Task task = new Task(() => method()); task.Start();. So how can I manage the CancellationToken? I would also like to know if like Thread I need to implement a logic to check if there're some Tasks that are still hangin...
How do I import a Swift file from another Swift file?
... If a Swift target has a space in its name, you can import it by replacing the spaces with underscores in the import statement. "My Swift Class" becomes "My_Swift_Class".
– Cin316
May 3 '15 at 22:47
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What is your single most favorite command-line trick using Bash? [closed]
...see all of your keyboard shortcuts listed? There are over 455 on Mac OS X by default.
105 Answers
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How do I make text bold in HTML?
... <b>
This element encloses text which should be rendered by the browser as boldface. Because the meaning of the B element defines the appearance of the content it encloses, this element is considered a "physical" markup element. As such, it doesn't convey the meaning of a semantic ...
How to assign a heredoc value to a variable in Bash?
...nt-execute-this)
foo"bar"''
Tabs can be inserted at the command line by pressing Ctrl-V Tab. If you are using an editor, depending on which one, that may also work or you may have to turn off the feature that automatically converts tabs to spaces.
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Determine the data types of a data frame's columns
..., 1, 1, 2, 2, 4, 2, ...
To get a list of the columns' data type (as said by @Alexandre above):
map(mtcars, class)
gives a list of data types:
$mpg
[1] "numeric"
$cyl
[1] "numeric"
$disp
[1] "numeric"
$hp
[1] "numeric"
To change data type of a column:
library(hablar)
mtcars %>%
con...