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Convert a Git folder to a submodule retrospectively?
...g a project of some kind, and after a while it becomes clear that some component of the project is actually useful as a standalone component (a library, perhaps). If you've had that idea from early on, then there's a fair chance that most of that code is in its own folder.
...
How can I delete all Git branches which have been merged?
...n merged? Is there an easy way to delete them all instead of deleting them one by one?
45 Answers
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How to write a switch statement in Ruby
...
It is done using case in Ruby. Also see "Switch statement" on Wikipedia.
Quoted:
case n
when 0
puts 'You typed zero'
when 1, 9
puts 'n is a perfect square'
when 2
puts 'n is a prime number'
puts 'n is an even number'
when ...
static constructors in C++? I need to initialize private static objects
... thanks! though that's very annoying to have to do all that. One of the many "mistakes" C# and java learned from.
– Gordon Gustafson
Jul 28 '09 at 22:59
110
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AngularJs: How to check for changes in file input fields?
...our File</button>
<input type="file" style="display:none"
id="file" name='file' onchange="angular.element(this).scope().fileNameChanged(this)" />
</form>
</div>
instead of
<input type="file" style="display:none"
id="fil...
What are static factory methods?
...s to provide a "spare" connection, failing with an exception if there are none.
public class DbConnection{
private static final int MAX_CONNS = 100;
private static int totalConnections = 0;
private static Set<DbConnection> availableConnections = new HashSet<DbConnection>();
...
How to compare objects by multiple fields
...a of using a single Comparator. I don't think this answer is wrong, but anyone reading it should definitely check Steve Kuo answer below.
– Felipe Leão
Nov 13 '14 at 12:15
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Renaming a virtualenv folder without breaking it
...e | grep -v "^Binary file" | grep -i venv-name. In fact, I noticed that in one of my Django instances, a lot of the packages had the "path to Python sh-bang" in them.
– Kevin
May 23 '16 at 14:01
...
Maintain the aspect ratio of a div with CSS
...revent its content from stretching it, you need to add an absolutely positioned child and stretch it to the edges of the wrapper with:
div.stretchy-wrapper {
position: relative;
}
div.stretchy-wrapper > div {
position: absolute;
top: 0; bottom: 0; left: 0; right: 0;
}
Here's a demo and an...
Group by multiple columns in dplyr, using string vector input
...= names(data)[-3]
library(dplyr)
df1 <- data %>%
group_by_at(vars(one_of(columns))) %>%
summarize(Value = mean(value))
#compare plyr for reference
df2 <- plyr::ddply(data, columns, plyr::summarize, value=mean(value))
table(df1 == df2, useNA = 'ifany')
## TRUE
## 27
The output ...