How to push to an array in a particular position?

Question

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 =         


        

Answer 1

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]