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What's the difference between ContentControl and ContentPresenter?
...o be used as-is while ContentControl is designed to be extended (inherited from)
– Nir
Jul 22 '11 at 21:26
25
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Creating an empty list in Python
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This is because this func make list from iterable types, you couldnt insert in more than 1 argument. (Try to type list('abcd') and you understand everything)
– Ivan Lavrenov
Oct 17 '18 at 8:10
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How to view or edit localStorage
...lication (formerly Resources) tab and you will see localStorage's content. From there you can add/edit/delete the key/value entries manually.
On OS X the keys are: ⌥ + ⌘ + i
Another combination: Ctrl + Shift + i
EDIT: In Chrome 56 it looks like this:
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Why does Javascript's regex.exec() not always return the same value? [duplicate]
...ex is global, if you call a method on the same regex object, it will start from the index past the end of the last match.
When no more matches are found, the index is reset to 0 automatically.
To reset it manually, set the lastIndex property.
reg.lastIndex = 0;
This can be a very useful fea...
TypeError: p.easing[this.easing] is not a function
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I am including this file from a CDN: <script src='http://ajax.googleapis.com/ajax/libs/jqueryui/1.8.5/jquery-ui.min.js'></script> Is it this one ? Or shall i include another file?
– Malloc
Sep 25 '1...
How to use Git properly with Xcode?
...rough git.
The .pbxproj file is simply a property list (similar to XML). From experience, just about the ONLY merge conflict you were ever get is if two people have added files at the same time. The solution in 99% of the merge conflict cases is to keep both sides of the merge, which for git at l...
Conditions for automatic generation of default/copy/move ctor and copy/move assignment operator?
...erhaps that having const members in the class will prevent the constructor from being auto-generated...
– nonsensickle
Jul 31 '14 at 23:08
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How to debug heap corruption errors?
...ay off over the long run. The desirable feature list should look familiar from dmalloc and electricfence, and the surprisingly excellent book Writing Solid Code:
sentry values: allow a little more space before and after each alloc, respecting maximum alignment requirement; fill with magic numbers...
In Jinja2, how do you test if a variable is undefined?
Converting from Django, I'm used to doing something like this:
6 Answers
6
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Elegant way to check for missing packages and install them?
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Yes. If you have your list of packages, compare it to the output from installed.packages()[,"Package"] and install the missing packages. Something like this:
list.of.packages <- c("ggplot2", "Rcpp")
new.packages <- list.of.packages[!(list.of.packages %in% installed.packages()[,"Pac...