how to insert node at a given position given value and index

i started coding i thought at first if i had an if statement to check if current and index are equal then i create a new node and populate it i would do i inside a while loop. But that tuned out yet incorrect. I watched neso academy video link i realised i needed first to create a node. then i decrement it first then enter a loop check if element is not equal to 1 then increment the current pointer which store head pointer to the next node. then decrement index by 1 again. after loop condition turns to be false then link the new node to the next node and link previous node before the new node to link to the new node. I learnt something new btw…

insertAt(value, index) {
let current = head;
const newNode = new Node(value);
index--;
while(index!=1){
current = current.nextNode;
index--;
}
newNode.nextNode = current.nextNode; // link newnode  to next node
current.nextNode = newNode; // link current to new node
return this;
}