Common NSString Methods:(15.2)

Method                                                         Description
+(id) stringWithContentsofFile:path encoding:enc error:err     Creates a new string and sets it to the path contents
                                                               of a file specified by the path using character encoding env, 
                                                               returning error in err if non-nil

+(id) stringWithContentsofURL:url encoding:enc error:err       Creates a new string and sets it to the contents of url
                                                               using character encoding enc, 
                                                               returning error in err if non-nil

+(id) string                                                   Creates a new empty string

+(id) stringWithString:nsstring                                Creates a new string, setting it to nsstring

+(NSString *) stringWithFormat:format, arg1, arg2, arg3...     Creats a new string according to the specified format
                                                               and arguments arg1, arg2, arg3 ...

-(id) initWithString:nsstring                                  Sets a newly allocated string to nsstring

-(id) initWithContentsofFile:path encoding:enc error:err       Sets a string to the contents of a file specified by path

-(id) initWithContentsofURL:url encoding:enc error:err         Sets a string to the contents of url(NSURL *)
                                                               url using character encoding enc, return error in err if non-nil

-(NSUInteger) length                                           Returns the number of characters in the string

-(unichar) characterAtIndex:i                                  Returns the Unicode character at index i

-(NSString) substringFromIndex:i                               Returns a substring from the character at i to the end

-(NSString) substringWithRange:range                           Returns a substring based on a specified range

-(NSString) substringToIndex:i                                 Returns a substring from the start of the string up to
                                                               the character at index i

-(NSComparator *) caseInsensitiveCompare:nsstring              Compares two strings, ignoring case

-(NSComparator *) compare:nsstring                             Compares tow strings

-(BOOL) hasPrefix:nsstring                                     Tests whether a string begins with nsstring

-(BOOL) hasSuffix:nsstring                                     Tests whether a string ends with nsstring

-(BOOL) isEqualToString:nsstring                               Tests whether two string are equal

-(NSString *) capitalizedString                                Returns a string with the first letter of every word capitalized

                                                               (and the remainning letters in each word converted to lowercase)
-(NSString *) lowercaseString                                  Returns a string converted to lowercase

-(NSString *) uppercaseString                                  Returns a string converted to uppercase

-(const char *) UTF8String                                     Returns a string converted to a UTF-8 C-style character string

-(double) doubelValue                                          Returns a double precision floating-point representation of the string

-(float) floatValue                                            Returns a floating-point representation of the string

-(NSInteger) integerValue                                      Returns a NSInteger representation of the string

-(int) intValue                                                Returns the integer representation of the string