Most efficient way to prepend a value to an array

Question

Assuming I have an array that has a size of N (where N > 0), is there a more efficient way of prepending to the array that would not require O(N

Answer 1

Example of prepending in-place:

var A = [7,8,9]
var B = [1,2,3]

A.unshift(...B)

console.log(A) // [1,2,3,7,8,9]