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Script parameters in Bash
...ation_file.txt
Explanation on double quotes;
consider three scripts:
# foo.sh
bash bar.sh $1
# cat foo2.sh
bash bar.sh "$1"
# bar.sh
echo "1-$1" "2-$2"
Now invoke:
$ bash foo.sh "a b"
1-a 2-b
$ bash foo2.sh "a b"
1-a b 2-
When you invoke foo.sh "a b" then it invokes bar.sh a b (two argum...
Set a persistent environment variable from cmd.exe
...ist after the cmd window has been closed.
For example, to set an env var "foo" with value of "bar":
setx foo bar
Though it's worth reading the 'notes' that are displayed if you print the usage (setx /?), in particular:
2) On a local system, variables created or modified by this tool will be ...
What are the differences between vector and list data types in R?
...ven other lists:
x <- list(values=sin(1:3), ids=letters[1:3], sub=list(foo=42,bar=13))
x # print the list
x$values # Get one element
x[["ids"]] # Another way to get an element
x$sub$foo # Get sub elements
x[[c(3,2)]] # Another way (gets 13)
str(x) # A "summary" of the list's content
Li...
split string only on first instance - java
...ntain all input beyond the last matched delimiter.
The string boo:and:foo, for example, yields the following results with these parameters:
Regex Limit Result
: 2 { "boo", "and:foo" }
: 5 { "boo", "and", "foo" }
: -2 { "boo", "and", "foo" }
o 5 { "...
EF Code First “Invalid column name 'Discriminator'” but no inheritance
....Schema.TableAttribute referring to the same table.
for example:
[Table("foo")]
public class foo
{
// some stuff here
}
[Table("foo")]
public class fooExtended
{
// more stuff here
}
changing the second one from foo to foo_extended fixed this for me and I'm now using Table Per Type (TPT...
Java SafeVarargs annotation, does a standard or best practice exist?
...e a variable number of arguments of a type-parameter type:
<T> void foo(T... args);
In Java, varargs are a syntactic sugar that undergoes a simple "re-writing" at compile-time: a varargs parameter of type X... is converted into a parameter of type X[]; and every time a call is made to this ...
how to break the _.each function in underscore.js
...s out of the loop when the element is found:
var searchArr = [{id:1,text:"foo"},{id:2,text:"bar"}];
var count = 0;
var filteredEl = _.find(searchArr,function(arrEl){
count = count +1;
if(arrEl.id === 1 ){
return arrEl;
}
});
...
What's the difference between an object initializer and a constructor?
...ation logic.
Below you can see an example of a constructor.
public class Foo
{
private SomeClass s;
public Foo(string s)
{
s = new SomeClass(s);
}
}
Now consider the following example:
public class Foo
{
public SomeClass s { get; set; }
public Foo() {}
}
You co...
Why is arr = [] faster than arr = new Array?
...owing tokens may be produced:
[]: ARRAY_INIT
[1]: ARRAY_INIT (NUMBER)
[1, foo]: ARRAY_INIT (NUMBER, IDENTIFIER)
new Array: NEW, IDENTIFIER
new Array(): NEW, IDENTIFIER, CALL
new Array(5): NEW, IDENTIFIER, CALL (NUMBER)
new Array(5,4): NEW, IDENTIFIER, CALL (NUMBER, NUMBER)
new Array(5, foo): NEW, I...
ignoring any 'bin' directory on a git project
...:
bin/
In the man page, there an example of ignoring a directory called foo using an analogous pattern.
Edit:
If you already have any bin folders in your git index which you no longer wish to track then you need to remove them explicitly. Git won't stop tracking paths that are already being tra...