public static bool IsBlankOrEmpty()

in Older/ReSharper20183CSharp/CSharp7Features.cs [37:48]

• 12 lines of code
• 5 McCabe index (conditional complexity)

        public static bool IsBlankOrEmpty(object o)
        {
            // 3. Split 'if' for || expressions in guard clauses
            //    See https://youtrack.jetbrains.com/issue/RSRP-471023
            switch (o)
            {
                case string s when string.IsNullOrEmpty(s) || s.All(c => c == ' '):
                    return true;
                default:
                    return o == null;
            }
        }