How to reproduce inserting an element in the middle of an array without losing elements?

Question

ruby

How is it possible to reproduce this action? If I understand correctly, then it is necessary to "remember" the element that will be lost and somehow "glue" them together. Thanks in advance for your reply.
Sample additional element:
9
Sample array:
[ 1 , 2 , 3 , 4 , 5 , 6 , 7 , 8 ]
Desired output:
[ 1 , 2 , 3 , 4 , 9 , 5 , 6 , 7 , 8 ]

Answer 1

I heard that there is an insert method - you specify the position and the elements you want to insert.