adding anotehr each method to String

[Chris Shea]

f it doesn't exist allready, i'd like to add another each method to
String similar to each_byte except it loops over chars for example :

"zero".each_char{|c| puts c}

would print-out :
z
e
r
o

i know how to add a new method to a given class, what i don't know is
specifically for methods like each which pass an arg to a given block...

What you need is "yield".

This does what you need:

class String
def each_char
0.upto(self.length - 1) do |x|
yield self[x,1]
end
end
end

yield passes a value to a block.

 

[John Joyce]

Might not do what you expect.
under current conditions you might get:
=A8
u

instead of
=FC

 

[Une Bévue]

f it doesn't exist allready, i'd like to add another each method to
String similar to each_byte except it loops over chars for example :

"zero".each_char{|c| puts c}

would print-out :
z
e
r
o

i know how to add a new method to a given class, what i don't know is
specifically for methods like each which pass an arg to a given block...

 

[John Joyce]

I mean you should check into the way Ruby works with multi-byte =20
characters!
But this should be watched carefully with every language.
Typing multibyte characters on many windows systems is a pain in the =20
behind. Luckily it's not so painful on osx, so I can type an umlaut =20
by option+u then the character I want it over.
Here is what happens...

irb(main):001:0> mystring =3D"\303\274mlaut"
=3D> "\303\274mlaut"
irb(main):002:0> puts mystring
=FCmlaut
=3D> nil
irb(main):003:0> puts mystring.length
7
=3D> nil

 

[Une Bévue]

Might not do what you expect.
under current conditions you might get:
¨
u

instead of
ü

then, u mean, it wouldn't work with NON-ASCII chars ?

it doesn't matter in fact because i'm playing with US-ASCII chars only
in that case.

but thanks a lot, better to know !

 

[Une Bévue]

What you need is "yield".

This does what you need:

class String
def each_char
0.upto(self.length - 1) do |x|
yield self[x,1]
end
end
end

yield passes a value to a block.

Ok, fine thanks a lot !

does the method :
String.to_a doing :

s="a string"
sa=s.to_a
#=> ['a',' ','s','t','r','i','n','g']

exists allready ?

generally speaking how to list-out, for a given class all the methods ?

in order to avoid collapsing them.

 

[Harold Hausman]

Ok, fine thanks a lot !

does the method :
String.to_a doing :

s=3D"a string"
sa=3Ds.to_a
#=3D> ['a',' ','s','t','r','i','n','g']

exists allready ?

irb(main):001:0> "a string".split( "" )
=3D> ["a", " ", "s", "t", "r", "i", "n", "g"]

generally speaking how to list-out, for a given class all the methods ?

irb(main):002:0> "a string".methods.sort
=3D> ["%", "*", "+", "<", "<<", "<=3D", "<=3D>", "=3D=3D", "=3D=3D=3D", "=
=3D~", ">", ">=3D", "[]", "
[]=3D", "__id__", "__send__", "all?", "any?", "between?", "capitalize", "ca=
pitaliz
e!", "casecmp", "center", "chomp", "chomp!", "chop", "chop!", "class", "clo=
ne",
"collect", "concat", "count", "crypt", "delete", "delete!", "detect", "disp=
lay",
"downcase", "downcase!", "dump", "dup", "each", "each_byte", "each_line", =
"each
_with_index", "empty?", "entries", "eql?", "equal?", "extend", "find", "fin=
d_all
", "freeze", "frozen?", "gem", "grep", "gsub", "gsub!", "hash", "hex", "id"=
, "in
clude?", "index", "inject", "insert", "inspect", "instance_eval", "instance=
_of?"
, "instance_variable_defined?", "instance_variable_get", "instance_variable=
_set"
, "instance_variables", "intern", "is_a?", "is_binary_data?", "is_complex_y=
aml?"
, "kind_of?", "length", "ljust", "lstrip", "lstrip!", "map", "match", "max"=
, "me
mber?", "method", "methods", "min", "next", "next!", "nil?", "object_id", "=
oct",
"partition", "private_methods", "protected_methods", "public_methods", "re=
ject"
, "replace", "require", "require_gem", "respond_to?", "reverse", "reverse!"=
, "ri
ndex", "rjust", "rstrip", "rstrip!", "scan", "select", "send", "singleton_m=
ethod
s", "size", "slice", "slice!", "sort", "sort_by", "split", "squeeze", "sque=
eze!"
, "strip", "strip!", "sub", "sub!", "succ", "succ!", "sum", "swapcase", "sw=
apcas
e!", "taguri", "taguri=3D", "taint", "tainted?", "to_a", "to_f", "to_i", "t=
o_s", "
to_str", "to_sym", "to_yaml", "to_yaml_properties", "to_yaml_style", "tr", =
"tr!"
, "tr_s", "tr_s!", "type", "unpack", "untaint", "upcase", "upcase!", "upto"=
, "zi
p"]



Hope that helps,
-Harold

 

[Une Bévue]

I mean you should check into the way Ruby works with multi-byte
characters!

because i'm a french guy, i knew that )))

but, as writen, for such a tiny script I'll restrict to US-ASCII
converting :

grüß

to

gruess

if y would be a german guy )))

in french it's easier i'll convert all the :

éèêë to e und so weiter !

i'll have to check (as for the german ß) for ligatures too :

æ -> ae again und so weiter !

thanks !

 

[Une Bévue]

exists allready ?

Yes, following :

ms=String.methods
puts ms.include?('to_a')


however :
s='toto'
s.to_a
# => ['toto']

 

[Une Bévue]

irb(main):001:0> "a string".split( "" )
=> ["a", " ", "s", "t", "r", "i", "n", "g"]

OK fine, then no need to extend String )))

generally speaking how to list-out, for a given class all the methods ?

irb(main):002:0> "a string".methods.sort => ["%", "*", "+", "<", "<<",
"<=", "<=>", "==", "===", "=~", ">", ">=", "[]", " []=", "__id__",
"__send__", "all?", "any?", "between?", "capitalize", "capitaliz e!",
"casecmp", "center", "chomp", "chomp!", "chop", "chop!", "class", "clone",
"collect", "concat", "count", "crypt", "delete", "delete!", "detect",
"display", "downcase", "downcase!", "dump", "dup", "each", "each_byte",
"each_line", "each _with_index", "empty?", "entries", "eql?", "equal?",
"extend", "find", "find_all ", "freeze", "frozen?", "gem", "grep", "gsub",
"gsub!", "hash", "hex", "id", "in clude?", "index", "inject", "insert",
"inspect", "instance_eval", "instance_of?" , "instance_variable_defined?",
"instance_variable_get", "instance_variable_set" , "instance_variables",
"intern", "is_a?", "is_binary_data?", "is_complex_yaml?" , "kind_of?",
"length", "ljust", "lstrip", "lstrip!", "map", "match", "max", "me mber?",
"method", "methods", "min", "next", "next!", "nil?", "object_id", "oct",
"partition", "private_methods", "protected_methods", "public_methods",
"reject" , "replace", "require", "require_gem", "respond_to?", "reverse",
"reverse!", "ri ndex", "rjust", "rstrip", "rstrip!", "scan", "select",
"send", "singleton_method s", "size", "slice", "slice!", "sort",
"sort_by", "split", "squeeze", "squeeze!" , "strip", "strip!", "sub",
"sub!", "succ", "succ!", "sum", "swapcase", "swapcas e!", "taguri",
"taguri=", "taint", "tainted?", "to_a", "to_f", "to_i", "to_s", " to_str",
"to_sym", "to_yaml", "to_yaml_properties", "to_yaml_style", "tr", "tr!" ,
"tr_s", "tr_s!", "type", "unpack", "untaint", "upcase", "upcase!", "upto",
"zi
p"]



Hope that helps,

Yes a lot, thanks again !

 

[Trans]

irb(main):001:0> "a string".split( "" )
=3D> ["a", " ", "s", "t", "r", "i", "n", "g"]

"a string".split(//)

T=2E

 

[Bertram Scharpf]

Hi,

Am Sonntag, 25. M=E4r 2007, 16:25:05 +0900 schrieb Une B=E9vue:

"zero".each_char{|c| puts c}
=20
would print-out :
z
e
r
o

The split method was already proposed.

"another".split //
"another".split ""
"another".scan /./
"=E4n=F6th=E9r".scan /./u # will preserve UTF-8 characters

"another".each_byte { |x| c =3D x.chr ; ... }
"another".unpack( "C*")
"=E4n=F6th=E9r".unpack( "U*")

Bertram


--=20
Bertram Scharpf
Stuttgart, Deutschland/Germany
http://www.bertram-scharpf.de

 

[James Edward Gray II]

f it doesn't exist allready, i'd like to add another each method to
String similar to each_byte except it loops over chars for example :

"zero".each_char{|c| puts c}

would print-out :
z
e
r
o

#!/usr/bin/env ruby -wKU

require "jcode"

"zero".each_char { |chr| p chr }
# >> "z"
# >> "e"
# >> "r"
# >> "o"

__END__

James Edward Gray II=

 

[Une Bévue]

#!/usr/bin/env ruby -wKU

require "jcode"

"zero".each_char { |chr| p chr }
# >> "z"
# >> "e"
# >> "r"
# >> "o"

__END__

thanks to all !

 

[Rick DeNatale]

exists allready ?

Yes, following :

ms=3DString.methods
puts ms.include?('to_a')


however :
s=3D'toto'
s.to_a
# =3D> ['toto']

This is because in Ruby a String doesn't act as a collection of
characters, it acts as a collection of lines.

s =3D "to\nto"
s.to_a =3D> ["to\n", "to"]

"to\nto".each {|l| puts l}
to
to

--=20
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/

 

[Phrogz]

s='toto'
s.to_a
# => ['toto']

This is because in Ruby a String doesn't act as a collection of
characters, it acts as a collection of lines.

s = "to\nto"
s.to_a => ["to\n", "to"]

To be pedantic, it's not really a collection of lines. It's a
collection of stuff-terminated-by-some-arbitrary-character-sequence.
The global variable $/ holds this special string:
=> "\n"
=> "foo-bar\njim-jam"
=> ["foo-bar\n", "jim-jam"]
=> ["foo-", "bar\njim-", "jam"]
=> ["foo-bar", "\njim-jam"]

 

[Rick DeNatale]

s=3D'toto'
s.to_a
# =3D> ['toto']

This is because in Ruby a String doesn't act as a collection of
characters, it acts as a collection of lines.

s =3D "to\nto"
s.to_a =3D> ["to\n", "to"]

To be pedantic, it's not really a collection of lines. It's a
collection of stuff-terminated-by-some-arbitrary-character-sequence.
The global variable $/ holds this special string

I think that a better name for
"stuff-terminated-by-some-arbitrary-character-sequence" would be
record. At least the 'english' library seems to think so since it
aliases $RS and $INPUT_RECORD_SEPARATOR to $/

--=20
Rick DeNatale

My blog on Ruby
http://talklikeaduck.denhaven2.com/