4 ms·

Accessing negative indexes currently returns undefined. This adds support for indexing from the end of an array with negative numbers.

• franciscop 5y ago
  This works, but not the way you'd think: const arr = []; arr[-1] = 'Hello world'; console.log(arr[-1]); // Hello world Instead of using the negative index, it stringifies the "-1" and uses it as the key of an object both when writing and reading. Thus, arr.length still remains 0