Here are some related threads from the past: https://esdiscuss.org/topic/negative-indices-for-arrays https://esdiscuss.org/topic/array-slice-syntax https://esdiscuss.org/topic/javascript-language-feature-idea
I think I’ve seen it mentioned a few other times too. The `arr[-1]` syntax is a non-starter I’m afraid, cause it’s just property access. An array can already have a property with the key "-1". Personally I’d find it weird for slicing to be singled out for special syntax. It’s just a method. However I’d agree that it’s quite awkward to do things like `arr[arr.length - 1]` or `arr.slice().pop()` etc to access from the right. I think in one of those threads someone proposed a method like `Array.prototype.nth()` which would accept negative indices, though this creates an odd asymmetry since (presumably) we would not want to use -0 for the last index. In general I think the functionality you’re describing could be useful but that it could be served better by adding methods rather than syntax.
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