This method checks if the string value is null, undefined, an empty string or only contains whiltespace \t \r \n \f \v characters.
value
\t \r \n \f \v
The string value to be checked.
true if the string is null, undefined an empty string or contains only whitespace characters.
true
This method checks if the string
valueis null, undefined, an empty string or only contains whiltespace\t \r \n \f \vcharacters.