Proposal-index-from-end array[^n]

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Proposal-index-from-end array[^n]

Cyril Auburtin
There has been many "array.last()" and similar proposals on es-discuss

It adds Array.prototype.lastIndex and Array.prototype.lastItem

I'd like to extend this idea with a syntax like `arr[^n]` (stands for `arr[arr.length - n]`), I wrote it in https://github.com/keithamus/proposal-array-last/issues/28


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