deletenode.js

    delete(value) {
        /*
        if the list is empty
        */
        if (this.head == null) {
            console.log("The list is empty");
        } 
        /*
        Traverse through list recursively
        */
        else {
            let currentNode = this.head;
            let previousNode = null;
            while (currentNode != null) {
                /*
                if `data` of `currentnode` matches
                with `value`
                */
                if (currentNode.data == value) {
                    break;
                }
                /*
                if not,set `previousnode` to `currentnode`
                so that if the `value` is found in the next iteration
                we can use `previousnode` to remove the `node` 
                */
                previousNode = currentNode;
                currentNode = currentNode.next;
            }
            /*
            if `value` is not in the list
            */
            if (currentNode == null) {
                console.log(`${value} is not in the list`);
            } 
            
            /*
            if `value` is in the list
            */
            else {
                
                /*
                if it is the `head` of the list
                then set `head` of the list to 
                `next` of `currentnode`
                */
                
                if (currentNode.data == this.head.data) {
                    this.head = currentNode.next;
                    
                } 
                /*
                if not,point `next` of `previousnode`
                to `next` of `currentnode` so that `currentnode`
                will be removed from the list
                */
                else {
                    previousNode.next = currentNode.next;
                 
                }
                /*
                decrement length
                */
                this.length--;
                console.log(`${value} is deleted from  the list`);
            }
        }
    }