#JavaScript: By default, array.flat() flattens up to...

#JavaScript: By default, array.flat() flattens up to depth 1.

> [ 'a', ['b'], [['c']], [[['d']]] ].flat()
[ 'a', 'b', [ 'c' ], [ [ 'd' ] ] ]

To go as deep as possible, pass it `Infinity`:

> [ 'a', ['b'], [['c']], [[['d']]] ].flat(Infinity)
[ 'a', 'b', 'c', 'd' ]

Like 8 Jul 2023 at 17:14 | Open on fosstodon.org

4 comments

is Infinity its own type? @rauschma

8 Jul 2023 at 17:47 | Open on fosstodon.org

@machenni @rauschma
> typeof(Infinity)
"number"

8 Jul 2023 at 18:05 | Open on mozilla.social

@machenni It’s a number:

> typeof Infinity
'number'

8 Jul 2023 at 18:07 | Open on fosstodon.org

@rauschma Too bad TypeScript can’t understand this trick. You’re capped at 20.

8 Jul 2023 at 22:05 | Open on fosstodon.org