Discussion on: Put Down the Destructuring Hammer

[Andreas Iosifelis]

I love how we can get the extension of a file name like so:

const [, extension] = filename.split('.')

[Joakim Hedlund]

I get the feeling this approach won't work well with files such as foo.bar.js. You may want to reverse() after splitting and picking the first entry as extension instead.

[Vesa Piittinen]

const filename = 'filename.test.js';
const extension = filename.split('.').pop();

Or if you must have destructure:

const [extension] = /[^.]+$/.exec(filename) ?? [];

But whichever solution that actually is able to select the very last part will work.