instance method Array#filter
Array#filter(iterator[, context]) → Array
Function) – An iterator function to use to test the elements.
Object) – An optional object to use as
thiswithin calls to the iterator.
Returns a new array containing all the items in this array for which
iterator returned a truthy value.
Array#filter acts as an ECMAScript 5 polyfill.
It is only defined if not already present in the user's browser, and it
is meant to behave like the native version as much as possible. Consult
the ES5 specification for more