配列をストリング化

簡単ですが結構使えたので備忘録 配列をリクエストで送るときに有効

var member_admins = ""
count = 0
for name in selectedMemberAdminList {
        if(count != 0){
            member_admins = member_admins + ","
        }
        member_admins = member_admins + name   
        count++
}