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Array.prototype.at and the postfix/prefix increment/decrement operator
const nums = [1, 2, 3];

this works just fine:

++nums[2] // 4

but this does not:

++nums.at(-1) // ReferenceError: Invalid left-hand side expression in prefix operation

Can someone please explain to me? It feels like it should work!!

Thank you

about 4 years ago · Juan Pablo Isaza
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