Obsolite code how do you fix it

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1

Unity tells me that this line is obsolete and I don’t know how to fix this.

Projectile missile = collider.gameObject.GetComponent ();

Also I have two lasers coming out of my ship can someone explain this to me as well.

2

It’s something I see with Unity 2017 and monodevelop, getcomponent autocompletion doesn’t work fine.
It’s Getcomponent ()

ie: Getcomponent ()