Linked List: Array to List

Linked Listseasy

A linked list node is represented as a plain object `{ val, next }`. Implement `arrayToList(arr)` that converts an array into a linked list and returns the head node. Example: `arrayToList([1,2,3])` → `{ val:1, next:{ val:2, next:{ val:3, next:null } } }`.

Sample tests

Input: arrayToList([1,2,3])

Output: {"val":1,"next":{"val":2,"next":{"val":3,"next":null}}}

Input: arrayToList([42])

Output: {"val":42,"next":null}

+ 1 hidden test run on Submit.

Hints

Common pitfalls

Losing the head reference while advancing the tail.

Learning resources

MDN: Objects

Approach & explanation (try first)

Build nodes left to right, linking each to the next, and keep the head. O(n) time and space.

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