Rule Request: Use where in loop instead of if

[kimdv]

For better readable code in my opinion it would be nice with a where rule for loops like.

I think it will make it more readable and there is less lines. Of course if there is multiple if or and if else it should be ignored

for user in users where user.id == "1" {
// Awesome code
}

instead of

for user in users {
    if user.id == "1" {
        // Awesome code
   }
}

[abagmut]

get false positive for:

var name = ""
for (index, value) in lines.enumerated()
{
	if index > 0
	{
		name += ", "
	}
	name += value
}

[marcelofabri]

There's already an open issue for that, as well as a PR.

[Coeur]

For reference:

• issues reporting the false positives introduced in 0.17.0: Improve for_where rule #1387, possible false positive with for_where (SwiftLint 0.17.0) #1404
• pull fixing the false positives in 0.17.1: Improve for_where rule #1393