Realpath() method?

ruby-talk
1

BTW, how is the coordination of the std. lib done?
Is it Matz to harrass with stupid notes like this one?
Or what’s the official way?

Sorry, if I just don’t see the forest for the tree, but do
we have some “normalize path” method somewhere
in the std. stuff (like realpath() of PHP)?

Thanks!
Sab

2

How to elegantly get the last char of a string as a string?
Somehow I fear I won’t be cacthing girls’ attention with this:

if ('' << str[str.length-1]) = 'x'
    str.chop
    do_things_with(str)
    ...
end

Thanks,
Sab

3

Sorry, if I just don’t see the forest for the tree, but do
we have some “normalize path” method somewhere
in the std. stuff (like realpath() of PHP)?

For the archive: File.expand_path

Sab

4

How to elegantly get the last char of a string as a string?
Somehow I fear I won’t be cacthing girls’ attention with this:

if ('' << str[str.length-1]) = 'x'
    str.chop
    do_things_with(str)
    ...
end

ibz@ignoramus:$ irb
Reading config file… done.
ruby-1.7.3 on i686-pc-linux with irb 0.9(02/07/03)
Type ‘help’ for more information.

str = “This is a string”
“This is a string”
str[-1].chr
“g”

Is that what you are looking for?

		--ibz.
···

–

5

Ahhh, yes! Thanks!

I was reading the Pragmatic… book and the String class
doesn’t have that ‘chr’ method there. (And a special thanks
for the negative indexes, which I missed completely…)

Thanks again,
Sab

···

----- Original Message -----
From: “Ibraheem Ibz Umaru-Mohammed” iumarumo@btinternet.com
To: “ruby-talk ML” ruby-talk@ruby-lang.org
Sent: Saturday, October 19, 2002 9:48 PM
Subject: Re: string[lastchar] → string?

How to elegantly get the last char of a string as a string?
Somehow I fear I won’t be cacthing girls’ attention with this:

if ('' << str[str.length-1]) = 'x'
    str.chop
    do_things_with(str)
    ...
end

ibz@ignoramus:$ irb
Reading config file… done.
ruby-1.7.3 on i686-pc-linux with irb 0.9(02/07/03)
Type ‘help’ for more information.

str = “This is a string”
“This is a string”
str[-1].chr
“g”

Is that what you are looking for?

–ibz.

6

(OK, I’m doing great today… Of course the String
class doesn’t have str() method… Er…, I was just asking
it for a friend of mine… :wink: )

Sab

···

----- Original Message -----
From: “Szabolcs Szasz” sz@szasz.hu
To: “ruby-talk ML” ruby-talk@ruby-lang.org
Sent: Saturday, October 19, 2002 9:55 PM
Subject: Re: string[lastchar] → string?

Ahhh, yes! Thanks!

I was reading the Pragmatic… book and the String class
doesn’t have that ‘chr’ method there. (And a special thanks
for the negative indexes, which I missed completely…)

Thanks again,
Sab

----- Original Message -----
From: “Ibraheem Ibz Umaru-Mohammed” iumarumo@btinternet.com
To: “ruby-talk ML” ruby-talk@ruby-lang.org
Sent: Saturday, October 19, 2002 9:48 PM
Subject: Re: string[lastchar] → string?

How to elegantly get the last char of a string as a string?
Somehow I fear I won’t be cacthing girls’ attention with this:

if ('' << str[str.length-1]) = 'x'
    str.chop
    do_things_with(str)
    ...
end

ibz@ignoramus:$ irb
Reading config file… done.
ruby-1.7.3 on i686-pc-linux with irb 0.9(02/07/03)
Type ‘help’ for more information.

str = “This is a string”
“This is a string”
str[-1].chr
“g”

Is that what you are looking for?

–ibz.

7

Ahhh, yes! Thanks!

I was reading the Pragmatic… book and the String class
doesn’t have that ‘chr’ method there. (And a special thanks
for the negative indexes, which I missed completely…)

I usually just fire up the interpreter, and do something like:

ibz@ignoramus:$ irb
Reading config file… done.
ruby-1.7.3 on i686-pc-linux with irb 0.9(02/07/03)
Type ‘help’ for more information.

String.methods.sort
[“<”, “<=”, “<=>”, “==”, “===”, “=~”, “>”, “>=”, “id”, “send”, “allocate”, “ancestors”, “become”, “class”, “class_eval”, “class_variables”, “clone”, “const_defined?”, “const_get”, “const_set”, “constants”, “display”, “dup”, “eql?”, “equal?”, “extend”, “freeze”, “frozen?”, “hash”, “id”, “include?”, “included_modules”, “inspect”, “instance_eval”, “instance_method”, “instance_methods”, “instance_of?”, “instance_variables”, “is_a?”, “kind_of?”, “method”, “method_defined?”, “methods”, “module_eval”, “name”, “new”, “nil?”, “private_class_method”, “private_instance_methods”, “private_methods”, “protected_instance_methods”, “protected_methods”, “public_class_method”, “public_instance_methods”, “public_methods”, “respond_to?”, “send”, “singleton_methods”, “superclass”, “taint”, “tainted?”, “to_a”, “to_s”, “type”, “untaint”]

Which helps a little when The Book isn’t nearby…

How to elegantly get the last char of a string as a string?
Somehow I fear I won’t be cacthing girls’ attention with this:

if ('' << str[str.length-1]) = 'x'
    str.chop
    do_things_with(str)
    ...
end

[— snip —]

Also, although you won’t be using the code above, you’ll find you’ve
forgotten a “=” and a “!” somewhere in there :wink:

		--ibz.
···

–

8

Well, you don’t really need the ‘chr’ method, which is a method of class
Integer. As long as you know about the negative indices, you can also
write

str[-1, 1]

This is related to item 5 in the newcomers’ list
(http://www.glue.umd.edu/~billtj/ruby.html#Getting%20characters%20from%20a%20String)

Regards,

Bill

···

===========================================================================
Szabolcs Szasz sz@szasz.hu wrote:

Ahhh, yes! Thanks!

I was reading the Pragmatic… book and the String class
doesn’t have that ‘chr’ method there. (And a special thanks
for the negative indexes, which I missed completely…)

9

I was reading the Pragmatic… book and the String class
doesn’t have that ‘chr’ method there.

That’s because it’s in the Integer class because characters are just
integer (codes).

str = “This is a string.”
“This is a string.”
str[-1]
46
str[-1].chr
“.”

···

–
Greg McIntyre
greg@puyo.cjb.net
http://puyo.cjb.net

10

There’s also ri

$ ri String

···

-----Original Message-----
From: ibraheem@ignoramus [mailto:ibraheem@ignoramus]On Behalf Of
Ibraheem Ibz Umaru-Mohammed
Sent: Saturday, October 19, 2002 1:03 PM
To: ruby-talk ML
Subject: Re: string[lastchar] → string?

Ahhh, yes! Thanks!

I was reading the Pragmatic… book and the String class
doesn’t have that ‘chr’ method there. (And a special thanks
for the negative indexes, which I missed completely…)

I usually just fire up the interpreter, and do something like:

 class: String

 A String object holds and manipulates an arbitrary sequence of
 bytes, typically representing characters. String objects may be
 created using String::new or as literals (see page 204).
 Because of aliasing issues, users of strings should be aware of the
 methods that modify the contents of a String object. Typically,
 methods with names ending in ``!'' modify their receiver, while
 those without a ``!'' return a new String. However, there are
 exceptions, such as String#[]=.

 %, *, +, <<, <=>, ==, ===, =~, [], []=, capitalize, capitalize!,
 center, chomp, chomp!, chop, chop!, concat, count, crypt, delete,
 delete!, downcase, downcase!, dump, each, each_byte, each_line,
 empty?, gsub, gsub!, hash, hex, include?, index, intern, length,
 ljust, new, next, next!, oct, replace, reverse, reverse!, rindex,
 rjust, scan, size, slice, slice!, split, squeeze, squeeze!, strip,
 strip!, sub, sub!, succ, succ!, sum, swapcase, swapcase!, to_f,
 to_i, to_s, to_str, tr, tr!, tr_s, tr_s!, unpack, upcase, upcase!,
 upto, ~

BTW, chr is not part of String, but belongs to Integers

$ ri chr
------------------------------------------------------------ Integer#chr
int.chr → aString

 Returns a string containing the ASCII character represented by the
 receiver's value.
    65.chr    #=> "A"
    ?a.chr    #=> "a"
    230.chr   #=> "\346"

James

11

“Ibraheem Ibz Umaru-Mohammed” iumarumo@btinternet.com wrote in message
news:20021019200233.GB5546@micromuse.com…

I usually just fire up the interpreter, and do something like:

ibz@ignoramus:$ irb
Reading config file… done.
ruby-1.7.3 on i686-pc-linux with irb 0.9(02/07/03)
Type ‘help’ for more information.

String.methods.sort

try

ri String

from the shell, only in 1.7

Mikkel