How to sort by id in Javascript?

Question

JavaScript

Hello. There is such a code

computed: {
    sortedPosts() {
        return [...this.posts].sort((post1, post2) => post1[this.selectedSort]?.localeCompare(post2[this.selectedSort]))
},
}

and such
((post1, post2) => post1.id - post2.id)
I want to add sorting by id. I don't understand why the code doesn't work. I do it like this.

computed: {
    sortedPosts() {
        return [...this.posts].sort((post1, post2) => post1[this.selectedSort]?.localeCompare(post2[this.selectedSort])?.(post1, post2) => post1.id - post2.id)
}
}

And I also tried that

computed: {
    sortedPosts() {
        return [...this.posts].sort((post1, post2) => post1[this.selectedSort]?.localeCompare(post2[this.selectedSort]):post1.id - post2.id)
}
}

Tell me what I'm doing wrong?