Detect if List if Changes after Filter - Javascript

Question

I need to detect if a list changes after using filter. Currently, I use the below code:

var bullets2 = bullets.filter((bullet) => {
    return (bullet[0] < 450)
})
if (bullets2.length != bullets.length) {
    bullets = bullets2
    update_user_pos()
}
bullets = bullets2

But this doesn't seem very effient. Is there a better way to do this?

Answer 1

Seems like that is the most efficient way, though @Bergi pointed out that I could removed the end bullets = bullets2.

New Code:

var bullets2 = bullets.filter((bullet) => {
    return (bullet[0] < 450)
})
if (bullets2.length != bullets.length) {
    bullets = bullets2
    update_user_pos()
}