JavaScript and the HTML5 DOM - HTML, CSS, and Dynamic HTML - page 1108

JavaScript Element Description

Array An array created using one of the following object constructors:

newƒArray()
newƒArray( size )
newƒArray( e1 , ƒe2 ,ƒ… ƒen )
where size is the number of elements in the array and e1 through en
are individual array elements. If no parameter value is provided, the array
automatically grows as more elements are added.

Properties
index For an array created by a regular expression match, the zero-based index of the

match in the string

input The original string against which the regular expression was matched

length The next empty index at the end of the array

prototype A mechanism to add properties to an array object

Methods
concat( array ) Combines two arrays and stores the result in a third array named array

every( predicate ) Tests whether the condition expressed in predicate holds for all elements in the

array (true) or one counter-example exists (false)

filter( predicate ) Invokes the predicate function, creating a new array populated with the elements

of the original array that return a value of true from the function

forEach( func ) Invokes the func function for each element within an array

i ndexOf( value [ , start ]) Searches an array, returning the index number of the first element equal to value ,

starting from the optional start index

join( string ) Stores each element in a text string named string

lastIndexOf( value [ , start ]) Searches backwards through an array, returning the index number of the first ele-

ment equal to value , starting from the optional start index

map( func ) Creates a new array by passing the original array elements to the func function,

which returns elements based on a specified condition or expression

pop( ) “Pops” the last element of the array and reduces the length of the array by 1

push( arg1 , arg2 , ... ) “Pushes” the elements in the list to the end of the array and returns the new length

reduce( func ) Reduces an array by passing the original array elements to the func function, keep-

ing only those elements which return a value of true

reduceRight( func ) Reduces an array from the last element by passing the original array elements to

the function, func , keeping only those elements which return a value of true

reverse( ) Reverses the order of the elements in the array

shift( ) Removes the first element from an array, returns that element, and shifts all other

elements down one index

slice( array, begin,end ) Extracts a portion of the array, starting at the index number begin and ending at

the index number end ; the elements are then stored in array

some( predicate ) Tests whether the condition expressed in predicate holds for any elements in the

array (true); otherwise the value is false

sort( function ) Sorts the array based on the function named function ; if function is omitted, the sort

applies dictionary order to the array

splice( start,howMany,
[, item1 [, item2 [,…]]] )

Removes howMany elements from the array, beginning at index start and replaces
the removed elements with the itemN arguments (if passed); returns an array of the
deleted elements

toLocaleString() Returns a localized string representation of the array

toString( ) Returns a string of the comma-separated values of the array

unshift([Item1 [,item2[,…]]]) Inserts the items to the front of an array and returns the new length of the array