13.15 The string type
   append( )
) 
The append( ) method appends the string
) method appends the string  to the end of a string.
 to the end of a string.   
    beginsWith( )
) 
The beginsWith( ) method returns a boolean indicating whether a string begins with the substring
) method returns a boolean indicating whether a string begins with the substring  .
.   
    endsWith( )
) 
The endsWith( ) method returns a boolean indicating whether a string ends with the substring
) method returns a boolean indicating whether a string ends with the substring  .
.   
    find( )
) 
The find( ) method returns the position of the first occurrence of
) method returns the position of the first occurrence of  in a string, or
 in a string, or  if it is not found.
 if it is not found.   
    findAll( )
) 
The findAll( ) method returns a list of the positions where the substring
) method returns a list of the positions where the substring  occurs in a string.
 occurs in a string.   
    isalnum() 
The isalnum() method returns a boolean indicating whether all of the characters of a string are alphanumeric.   
    isalpha() 
The isalpha() method returns a boolean indicating whether all of the characters of a string are alphabetic.   
    isdigit() 
The isdigit() method returns a boolean indicating whether all of the characters of a string are numeric.   
    len() 
The len() method returns the length of a string.   
    lower() 
The lower() method converts a string to lowercase.   
    lstrip() 
The lstrip() method strips whitespace off the beginning of a string.   
    split() 
The split() method returns a list of all the whitespace-separated words in a string.   
    splitOn(...) 
The splitOn(...) method splits a string whenever it encounters any of the substrings supplied as arguments, and returns a list of the split string segments.   
    strip() 
The strip() method strips whitespace off the beginning and end of a string.   
    rstrip() 
The rstrip() method strips whitespace off the end of a string.   
    upper() 
The upper() method converts a string to uppercase.