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How to sort git tags by version string order of form rc-X.Y.Z.W?
...
Prepend "-" to reverse sort order.
So, if you have:
git tag foo1.3 &&
git tag foo1.6 &&
git tag foo1.10
Here is what you would get:
# lexical sort
git tag -l --sort=refname "foo*"
foo1.10
foo1.3
foo1.6
# version sort
git tag -l --sort=version:refname "foo*"
foo1.3
...
What is the difference between ${var}, “$var”, and “${var}” in the Bash shell?
...races ($var vs. ${var})
In most cases, $var and ${var} are the same:
var=foo
echo $var
# foo
echo ${var}
# foo
The braces are only needed to resolve ambiguity in expressions:
var=foo
echo $varbar
# Prints nothing because there is no variable 'varbar'
echo ${var}bar
# foobar
Quotes ($var vs. "...
What is the Python equivalent of static variables inside a function?
...
A bit reversed, but this should work:
def foo():
foo.counter += 1
print "Counter is %d" % foo.counter
foo.counter = 0
If you want the counter initialization code at the top instead of the bottom, you can create a decorator:
def static_vars(**kwargs):
d...
Is a `=default` move constructor equivalent to a member-wise move constructor?
...copy will be used for both members: http://coliru.stacked-crooked.com/a/171fd0ce335327cd - prints:
movable::copy
nonmovable::copy
So probably putting =default everywhere still makes sense. It doesn't mean that your move expressions will always move, but it makes chances of this higher.
One more ...
Split data frame string column into multiple columns
...ry(tidyr)
before <- data.frame(
attr = c(1, 30 ,4 ,6 ),
type = c('foo_and_bar', 'foo_and_bar_2')
)
before %>%
separate(type, c("foo", "bar"), "_and_")
## attr foo bar
## 1 1 foo bar
## 2 30 foo bar_2
## 3 4 foo bar
## 4 6 foo bar_2
...
Python Remove last 3 characters of a string
...
Removing any and all whitespace:
foo = ''.join(foo.split())
Removing last three characters:
foo = foo[:-3]
Converting to capital letters:
foo = foo.upper()
All of that code in one line:
foo = ''.join(foo.split())[:-3].upper()
...
Reference: What is variable scope, which variables are accessible from where and what are “undefined
...cope", or "places from which they are accessible". Just because you wrote $foo = 'bar'; once somewhere in your application doesn't mean you can refer to $foo from everywhere else inside the application. The variable $foo has a certain scope within which it is valid and only code in the same scope ha...
When is a C++ destructor called?
...s out of scope,
// but not the object it pointed to. memory leak
if (1) {
Foo *myfoo = new Foo("foo");
}
// pointer is destroyed because it goes out of scope,
// object it points to is deleted. no memory leak
if(1) {
Foo *myfoo = new Foo("foo");
delete myfoo;
}
// no memory leak, object goes o...
Struct Constructor in C++?
...r problems.
If you declare your struct like this:
typedef struct{
int x;
foo(){};
} foo;
You will have problems trying to declare a constructor. This is of course because you haven't actually declared a struct named "foo", you've created an anonymous struct and assigned it the alias "foo". Thi...
Call a “local” function within module.exports from another function in module.exports?
...
Change this.foo() to module.exports.foo()
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