item() proposal does not substitute this proposal

[drpicox]

Although it seems that:

const last = array.lastItem;
const last = array.item(-1);

both are equivalent, they are not:

array.lastItem = newValue;
array.item(-1) = newValue; // it does not make sense

the assignation is not part of the .item() proposal.

I have seen in the issues of this proposal interesting alternatives like:

• A syntax approach (arr[^n] for arr[arr.length-n]) #28 array[ ^n]
• Negative indexes with array.get(-1) and array.set(-1, value) #23 array.get & array.set

See tc39/proposal-relative-indexing-method#16 for the mirroring of this issue.

[keithamus]

I'm not sure assignment has a convincing enough use case to warrant being specced. See #16