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What does %w(array) mean?
...
%w(foo bar) is a shortcut for ["foo", "bar"]. Meaning it's a notation to write an array of strings separated by spaces instead of commas and without quotes around them. You can find a list of ways of writing literals in zenspide...
What is a Manifest in Scala and when do you need it?
...nted to treat a List[String] differently from other types of a List:
def foo[T](x: List[T])(implicit m: Manifest[T]) = {
if (m <:< manifest[String])
println("Hey, this list is full of strings")
else
println("Non-stringy list")
}
foo(List("one", "two")) // Hey, this l...
How to create arguments for a Dapper query dynamically
...ffer a full example here.
string query = "SELECT * FROM MyTableName WHERE Foo = @Foo AND Bar = @Bar";
Dictionary<string, object> dictionary = new Dictionary<string, object>();
dictionary.Add("@Foo", "foo");
dictionary.Add("@Bar", "bar");
var results = connection.Query<MyTableName&g...
php is null or empty?
...
As is shown in the following table, empty($foo) is equivalent to $foo==null and is_null($foo) has the same function of $foo===null. The table also shows some tricky values regarding the null comparison. (ϕ denotes an uninitialized variables. )
empty is_n...
In laymans terms, what does 'static' mean in Java? [duplicate]
... don't need to create an instance of the class to access it.
public class Foo {
public static void doStuff(){
// does stuff
}
}
So, instead of creating an instance of Foo and then calling doStuff like this:
Foo f = new Foo();
f.doStuff();
You just call the method directly again...
PEP 8, why no spaces around '=' in keyword argument or a default parameter value?
...rgument. So consider this:
func(1, 2, axis='x', angle=90, size=450, name='foo bar')
over this:
func(1, 2, axis = 'x', angle = 90, size = 450, name = 'foo bar')
Also, it doesn't make much sense to use variables as default values. Perhaps some constant variables (which aren't really constants) a...
Java8: Why is it forbidden to define a default method for a method from java.lang.Object
...ltiple inheritance.
Further, imagine you are writing this class:
class Foo implements com.libraryA.Bar, com.libraryB.Moo {
// Implementation of Foo, that does NOT override equals
}
The Foo writer looks at the supertypes, sees no implementation of equals, and concludes that to get referenc...
Remove blank lines with grep
...
Try the following:
grep -v -e '^$' foo.txt
The -e option allows regex patterns for matching.
The single quotes around ^$ makes it work for Cshell. Other shells will be happy with either single or double quotes.
UPDATE: This works for me for a file with bl...
return statement vs exit() in main()
...o anything special about auto storage in main(). Please take care to read Footnote #11 below the paragraph you referenced in your comment.
– Greg A. Woods
Dec 9 '15 at 19:21
1
...
Django - How to rename a model field using South?
... # Rename 'name' field to 'full_name'
db.rename_column('app_foo', 'name', 'full_name')
def backwards(self, orm):
# Rename 'full_name' field to 'name'
db.rename_column('app_foo', 'full_name', 'name')
The first argument of db.rename_column is the table name, so...