Simpler form

[absolux]

What about simply use -1 as index

let arr = ['foo', 'bar', 'baz']

console.log(arr[-1]) // prints "baz"

[keithamus]

I'm afraid this wouldn't be possible due to that have existing behaviour today, which people - unfortunately - rely on. Right now code that uses that would return undefined and for that to change to a value would have a large potential to break the web.