Stage 3 Proposal: Array.prototype.at

Re:Stage 3 Proposal: Array.prototype.at by pininja on Wednesday June 02, 2021 @08:39AM (#27367980)

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

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Re:Stage 3 Proposal: Array.prototype.at by franciscop on Wednesday June 02, 2021 @08:57AM (#27368143)

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

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