javascript - How to push to an array in a particular position?

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I'm trying to efficiently
write a statement that pushes to position 1 of an array, and pushes whatever is in that
position, or after it back a
spot.

array =
            [4,5,9,6,2,5]

#push 0 to position 1

array =
            [4,0,5,9,6,2,5]

#push 123 to position
            1


array =
            [4,123,0,5,9,6,2,5]

What
is the best way to write this? (javascript or coffeescript
acceptable)

Thanks!

Answer

array =
            [4,5,9,6,2,5]

#push 0 to position
            1

array.splice(1,0,0)

array =
            [4,0,5,9,6,2,5]

#push 123 to position
            1
array.splice(1,0,123)

array =
            [4,123,0,5,9,6,2,5]