i am pushing  array elements as dynamically i need last before array value every time..

ex:

var array=[1,2,3,4,5,6,7,8,9,10]

 i need 9 

if i have 3 var array=[1,2,3] <=== this time i want 2

i tried like this                                      

array=[1,2,3,4,5,6,7,8,9,10]

console.log(array[array.length-1]) it is giving 10

if i put array.length-2 it is giving correctly..but i don't want manual entry..