Editing JavaScript/JScript (section)

===Arrays===

Arrays sind Objekte which can contain different objects. Arrays werden durch
 var arr = '''['''[( <Number> | <Element> {,<Element>})]'''];'''
 var arr = '''new Array('''[( <Number> | <Element> {,<Element>})]''');'''
 var arr = '''new Array<'''<TYPE>'''>(....)'''

deklariert. In JavaScript, arrays always use numbered indexes. Die Indizierung ist 0-based. Arrays haben eine member variable '''length'''. JavaScript does not support associative arrays. If you use a named index, JavaScript will redefine the array to a standard object. After that, all array methods and properties will produce incorrect results.

To empty an array you can:
 x.length = 0; // empties an existing array
 x = []; // creates a new array

To delete an array element without leaving holes use:
 x.splice(<index>, <length of array section to delete>);

====Methoden der Array-Klasse====

=====push()=====
adds an element at the end

=====pop()=====
removes the last element

=====splice()=====
 splice(i,n)
removes n elements starting at i

=====shift()=====
removes the first element

=====unshift()=====
The unshift() method adds new items to the beginning of an array, and returns the new length.
 var fruits = ["Banana", "Orange", "Apple", "Mango"];
 fruits.unshift("Lemon","Pineapple");