instance method String#blank
String#blank() → BooleanCheck if the string is "blank" — either empty (length of 0) or
containing only whitespace.
Example
''.blank(); //-> true ' '.blank(); //-> true ' a '.blank(); //-> false
String#blank() → BooleanCheck if the string is "blank" — either empty (length of 0) or
containing only whitespace.
''.blank(); //-> true ' '.blank(); //-> true ' a '.blank(); //-> false