Is only charging your iphone with your laptop bad for the phone's battery?

I don't have an outlet by my bed so I use my laptop to charge my phone, but I was just wondering if it was bad for the battery life since it takes slower to charge with the laptop

No! Its perfectly fine to use the laptop, it just takes longer because there's more power in an outlet than in a laptop

No it is fine

Not at all, but make sure you charge it completely

It is fine they are designed to do this exact thing, only thing note that USB does not have as much current as the adapter so it will take slightly longer to charge