Convert user to id

[Cubix-Gamer]

Hello,
I would like to get the id of a user for a system that uses ids. The problem is, I can't find any line of code that can do this. I know there is a way to do the reverse (Id -> User), but that's not what I'm interested in.
Thank you in advance.

[Androz2091]

Hello, you can use message.mentions.users.first().id.

[Cubix-Gamer]

I am using this ${message.mentions.users.first(1)} but its gives me the username and not the id and that's why I can't use user.id.

[Androz2091]

I updated my answer

[Cubix-Gamer]

That answers me undefined

EDIT: It works Thanks

[Androz2091]

perfect 👌
if you're still here, note that you can mark this issue as resolved

[kyranet]

User -> ID: user.id.
ID -> User: client.users.cache.get(id);