Array construction with spread syntax and map doesn't work

I use this syntax quite a lot to create my Arrays

const foos =
    [...Array(4)]
        .map(x => 'foo');
// ['foo', 'foo', 'foo', 'foo']

But on your platform the array has the good size but of “undefined” element.

See here : https://stackblitz.com/edit/js-mtffex

[seveves]

Your pattern should definitely work but how about using Array.from({ length: 4 }, x => 'foo')); 😎

[sulco]

Good catch everyone, thanks for reporting this! Yeah, it was confusing…

Thankfully it should no longer be an issue 😃