Hi,
my problem is obviously very basic, but how to I acces for example the third character of the string "hello" ??
The [] method does not behave as expected, the each method returns the whole string, the methods of Enumerable mixin don't help me...
This can't be that hard to solve!?
thanks Boris
Boris Glawe wrote:
Hi,
my problem is obviously very basic, but how to I acces for example
the third
character of the string "hello" ??
The method does not behave as expected, the each method returns
the whole
string, the methods of Enumerable mixin don't help me...
This can't be that hard to solve!?
thanks Boris
Just convert the Fixnum into a character:
irb(main):005:0> s = 'hello'
=> "hello"
irb(main):006:0> s[2]
=> 108
irb(main):007:0> s[2].chr
=> "l"
From the docs:
--------------------------------------------------------------
String#
str[fixnum] => fixnum or nil
str[fixnum, fixnum] => new_str or nil
str[range] => new_str or nil
str[regexp] => new_str or nil
str[regexp, fixnum] => new_str or nil
str[other_str] => new_str or nil
str.slice(fixnum) => fixnum or nil
str.slice(fixnum, fixnum) => new_str or nil
str.slice(range) => new_str or nil
str.slice(regexp) => new_str or nil
str.slice(regexp, fixnum) => new_str or nil
str.slice(other_str) => new_str or nil
------------------------------------------------------------------------
Element Reference---If passed a single +Fixnum+, returns the code
of the character at that position. If passed two +Fixnum+ objects,
returns a substring starting at the offset given by the first, and
a length given by the second. If given a range, a substring
containing characters at offsets given by the range is returned.
In
all three cases, if an offset is negative, it is counted from the
end of _str_. Returns +nil+ if the initial offset falls outside
the
string, the length is negative, or the beginning of the range is
greater than the end.
If a +Regexp+ is supplied, the matching portion of _str_ is
returned. If a numeric parameter follows the regular expression,
that component of the +MatchData+ is returned instead. If a
+String+ is given, that string is returned if it occurs in _str_.
In both cases, +nil+ is returned if there is no match.
a = "hello there"
a[1] #=> 101
a[1,3] #=> "ell"
a[1..3] #=> "ell"
a[-3,2] #=> "er"
a[-4..-2] #=> "her"
a[12..-1] #=> nil
a[-2..-4] #=> ""
a[/[aeiou](.)\1/] #=> "ell"
a[/[aeiou](.)\1/, 0] #=> "ell"
a[/[aeiou](.)\1/, 1] #=> "l"
a[/[aeiou](.)\1/, 2] #=> nil
a["lo"] #=> "lo"
a["bye"] #=> nil
puts "hello"[2] #=> 108
puts "hello"[2..2] #=> "l"
On May 18, 2005, at 5:40 PM, Boris Glawe wrote:
my problem is obviously very basic, but how to I acces for example the third character of the string "hello" ??
hello[2,1] => 'l'
regards,
Brian
On 19/05/05, Boris Glawe <boris@boris-glawe.de> wrote:
Hi,
my problem is obviously very basic, but how to I acces for example the third
character of the string "hello" ??The method does not behave as expected, the each method returns the whole
string, the methods of Enumerable mixin don't help me...This can't be that hard to solve!?
thanks Boris
--
http://ruby.brian-schroeder.de/
Stringed instrument chords: http://chordlist.brian-schroeder.de/
Assaph Mehr wrote:
Boris Glawe wrote:
Hi,
my problem is obviously very basic, but how to I acces for example
the third
character of the string "hello" ??
The method does not behave as expected, the each method returns
the whole
string, the methods of Enumerable mixin don't help me...
This can't be that hard to solve!?
thanks Boris
Just convert the Fixnum into a character:
irb(main):005:0> s = 'hello'
=> "hello"
irb(main):006:0> s[2]
=> 108
irb(main):007:0> s[2].chr
=> "l"
thanks that's as smooth as I expected it from ruby 
Solutions like string[2..2], as they are shown in the documentation, are not very nice!
greets Boris