Null Check in different language

Python - Null Check

15 or "default"       # returns 15
0 or "default"         # returns "default"
None or "default"    # returns "default"
False or "default"    # returns "default"

Django Template - None Check


{{obj.item_value|default_if_none:"smile"}}

C# - Null Check

var data = val ?? "default value";

Java - Null check

Foo f = new Foo();
DummyObj obj = new Obj().getSelection();
String str = obj != null ? f.format(obj) : "";

Javscript - Null/Undefined check

if (! param) param = "abc";
//other way to check this
if (param == null) is same as if(!param)


jQuery - Null/existence check

if ( $('#myDivObj').length ) {}

Feel free to add comments and other languages Null check mechanism (inline or explicit)