reverseLinkedListIterative.js

const reverseList = (head) => {
        //initiate previous as null
        let previous = null
        //initiate next without assigning
        let next 
       //keep iteration while head is not null
    while(head){
        //store the current node's next node    
        next = head.next
        //reassign head's next with previous node
        head.next = previous
        //reassign previous with reversed current node
        previous = head
        //reassign head with next node
        head = next
    }
    //after reversing return previous list
    return previous
};