METHOD: Array::unshift 
Array.unshift(element1,..., elementN)
The unshift method adds one or more elements to the beginning of an array
and returns the new length. The following code first creates an array called
'trees' and then uses the unshift method to add two new elements to the
beginning of it, returning the new length of the array. Finally, the third
line of code displays all the elements of the altered array:
Code:
trees = ["beech", "maple", "sycamore"]
document.write(trees.unshift("oak", "ash"))
document.write("<BR>" + trees)
Output:
5
oak,ash,beech,maple,sycamore
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