How to check if a string has certain characters at the beginning?

Question

go

Good afternoon. More precisely, you need to check if there is a https://. If there is, leave it as is; if not, stick it on. It is clear that if, but how to actually check if there is at the beginning https://?

Answer 1

strings.HasPrefix("Gopher", "Go")
Documentation here

Answer 2

RTFM https://golang.org/pkg/strings/#HasPrefix