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Do you need to dispose of objects and set them to null?
...ject references
Jon Skeet compared object references in Java to pieces of string that are attached to the balloon, which is the object. Same analogy applies to C# object references. They simply point to a location of the heap that contains the object. Thus, setting it to null has no immediate effec...
Same Navigation Drawer in different Activities
...blic DrawerLayout drawerLayout;
public ListView drawerList;
public String[] layers;
private ActionBarDrawerToggle drawerToggle;
private Map map;
protected void onCreate(Bundle savedInstanceState)
{
// R.id.drawer_layout should be in every activity with exactly the sa...
Get parts of a NSURL in objective-c
I have an NSString with the value of
2 Answers
2
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How do I set a column value to NULL in SQL Server Management Studio?
...value and clicking enter will not create a NULL value. If the column is a string datatype (varchar and the like), it will create an empty string. If the column is a numeric datatype (int and the like) it will pop up an Invalid Value error. And so on. NULL is the absence of a value, and is does no...
What's the state of the art in email validation for Rails?
...del:
class TestUser
include Mongoid::Document
field :email, type: String
validates :email, email: true
end
Your validator (goes in app/validators/email_validator.rb)
class EmailValidator < ActiveModel::EachValidator
EMAIL_ADDRESS_QTEXT = Regexp.new '[^\\x0d\\x22\\x5c\\x8...
“is” operator behaves unexpectedly with integers
...
This can be a very fast check relative to say, checking if two very long strings are equal in value. But since it applies to the uniqueness of the object, we thus have limited use-cases for it. In fact, we mostly want to use it to check for None, which is a singleton (a sole instance existing in o...
JavaScript function to add X months to a date
...eb 2016 -> 28 Feb 2017
console.log(addMonths(new Date(2016,1,29),12).toString());
// Subtract 1 month from 1 Jan 2017 -> 1 Dec 2016
console.log(addMonths(new Date(2017,0,1),-1).toString());
// Subtract 2 months from 31 Jan 2017 -> 30 Nov 2016
console.log(addMonths(new Date(2017,0,3...
Lowercase JSON key names with JSON Marshal in Go
...or example:
type T struct {
FieldA int `json:"field_a"`
FieldB string `json:"field_b,omitempty"`
}
This will generate JSON as follows:
{
"field_a": 1234,
"field_b": "foobar"
}
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How to make a Java thread wait for another thread's output?
...
import org.junit.Test;
public class ThreadTest {
public void print(String m) {
System.out.println(m);
}
public class One implements Callable<Integer> {
public Integer call() throws Exception {
print("One...");
Thread.sleep(6000);
...
Scala: Nil vs List()
...t? Example - scala> Map(1 -> "hello", 2 -> "world").foldLeft(List[String]())( (acc, el) => acc :+ el._2) res1: List[String] = List(hello, world) Using Nil as the accumulator here wouldn't work.
– Kevin Meredith
Nov 17 '13 at 4:57
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