From: Robert Dober <robert.dober@...>
Date: 2007-03-03T17:00:20+09:00
Subject: Re: String.each

On 3/3/07, ara.t.howard@noaa.gov <ara.t.howard@noaa.gov> wrote:
> On Sat, 3 Mar 2007, Yannick Grams wrote:
>
> > Hello all!
> >
> > I'm fairly new to Ruby, and I'm trying to write a program that looks at
> > each character of a string and then processes it using a block. I've
> > been using:
> >
> > String.each do
> >   #block
> > end
> >
> > but something isn't working. I'm sure that there is a simple answer, but
> > I'm not that experienced with the language. If someone could please help
> > me out, I'd greatly appreciate it.
> >
> > --
> > Posted via http://www.ruby-forum.com/.
>
> harp: ~> ri String#each
> ------------------------------------------------------------ String#each
>       str.each(separator=$/) {|substr| block }        => str
>       str.each_line(separator=$/) {|substr| block }   => str
> ------------------------------------------------------------------------
>       Splits _str_ using the supplied parameter as the record separator
>       (+$/+ by default), passing each substring in turn to the supplied
>       block. If a zero-length record separator is supplied, the string is
>       split on +\n+ characters, except that multiple successive newlines
>       are appended together.
>
>          print "Example one\n"
>          "hello\nworld".each {|s| p s}
>          print "Example two\n"
>          "hello\nworld".each('l') {|s| p s}
>          print "Example three\n"
>          "hello\n\n\nworld".each('') {|s| p s}
>
>       _produces:_
>
>          Example one
>          "hello\n"
>          "world"
>          Example two
>          "hel"
>          "l"
>          "o\nworl"
>          "d"
>          Example three
>          "hello\n\n\n"
>          "world"
>
>
> harp:~ > ruby -e'  puts String.instance_methods.grep(/each/)  '
> each
> each_with_index
> each_line
> each_byte
>
>
> harp:~ > ruby -e'  "foobar".each_byte{|b| p b}  '
> 102
> 111
> 111
> 98
> 97
> 114
>
>
> harp:~ > ruby -e'  "foobar".each_byte{|b| p b.chr}  '
> "f"
> "o"
> "o"
> "b"
> "a"
> "r"
>
>
> -a
> --
> be kind whenever possible... it is always possible.
> - the dalai lama
>
>

I'd like to add two remarks
(1) ruby -e'  "foobar".split("").each{|b| p b} '
and
(2) I feel it is a pity that
s.each("") is not the same as s.split("").each
and
(3)
"foobar".to_a does not deliver "foobar".split(""). The Arrayness of
String might even indicate that String#to_a return an array of bytes
as delivered by #[index]?
Note that the easiest way to do this ( which I found ) was

x=[]; each_byte{ |b| x << b}; x


Cheers
Robert


-- 
There are three kinds of people, those who can count and those who can't.